Unprefix flexbox properties in various CSS files

Source/core/css/mediaControls.css

 /*
  * Copyright (C) 2009 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 21 matching lines @@
 audio {
     width: 300px;
     height: 30px;
 }
 
 ::-webkit-media-controls {
     width: inherit;
     height: inherit;
     position: relative;
     direction: ltr;
-    display: -webkit-flex;
-    -webkit-flex-direction: column;
-    -webkit-justify-content: flex-end;
-    -webkit-align-items: center;
+    display: flex;
+    flex-direction: column;
+    justify-content: flex-end;
+    align-items: center;
 }
 
 audio::-webkit-media-controls-enclosure, video::-webkit-media-controls-enclosure {
     width: 100%;
     max-width: 800px;
     height: 30px;
-    -webkit-flex-shrink: 0;
+    flex-shrink: 0;
     bottom: 0;
     text-indent: 0;
     padding: 0;
     box-sizing: border-box;
 }
 
 video::-webkit-media-controls-enclosure {
     padding: 0px 5px 5px 5px;
     height: 35px;
-    -webkit-flex-shrink: 0;
+    flex-shrink: 0;
 }
 
 audio::-webkit-media-controls-panel, video::-webkit-media-controls-panel {
-    display: -webkit-flex;
-    -webkit-flex-direction: row;
-    -webkit-align-items: center;
+    display: flex;
+    flex-direction: row;
+    align-items: center;
     /* We use flex-start here to ensure that the play button is visible even
      * if we are too small to show all controls.
      */
-    -webkit-justify-content: flex-start;
+    justify-content: flex-start;
     -webkit-user-select: none;
     position: relative;
     width: 100%;
     z-index: 0;
     overflow: hidden;
     text-align: right;
     bottom: auto;
     height: 30px;
     background-color: rgba(20, 20, 20, 0.8);
     border-radius: 5px;
@@ skipping 13 matching lines @@
     max-width: 100%;
 }
 
 audio:-webkit-full-page-media::-webkit-media-controls-panel,
 video:-webkit-full-page-media::-webkit-media-controls-panel {
     bottom: 0px;
 }
 
 audio::-webkit-media-controls-mute-button, video::-webkit-media-controls-mute-button {
     -webkit-appearance: media-mute-button;
-    display: -webkit-flex;
-    -webkit-flex: none;
+    display: flex;
+    flex: none;
     border: none;
     box-sizing: border-box;
     width: 35px;
     height: 30px;
     line-height: 30px;
     margin: 0 6px 0 0;
     padding: 0;
     background-color: initial;
     color: inherit;
 }
 
 audio::-webkit-media-controls-overlay-play-button, video::-webkit-media-controls-overlay-play-button {
     display: none;
 }
 
 audio::-webkit-media-controls-play-button, video::-webkit-media-controls-play-button {
     -webkit-appearance: media-play-button;
-    display: -webkit-flex;
-    -webkit-flex: none;
+    display: flex;
+    flex: none;
     border: none;
     box-sizing: border-box;
     width: 30px;
     height: 30px;
     line-height: 30px;
     margin-left: 9px;
     margin-right: 9px;
     padding: 0;
     background-color: initial;
     color: inherit;
 }
 
 audio::-webkit-media-controls-timeline-container, video::-webkit-media-controls-timeline-container {
     -webkit-appearance: media-controls-background;
-    display: -webkit-flex;
-    -webkit-flex-direction: row;
-    -webkit-align-items: center;
-    -webkit-justify-content: flex-end;
-    -webkit-flex: 1 1;
+    display: flex;
+    flex-direction: row;
+    align-items: center;
+    justify-content: flex-end;
+    flex: 1 1;
     -webkit-user-select: none;
     height: 16px;
     min-width: 0;
 }
 
 audio::-webkit-media-controls-current-time-display, video::-webkit-media-controls-current-time-display,
 audio::-webkit-media-controls-time-remaining-display, video::-webkit-media-controls-time-remaining-display {
     -webkit-appearance: media-current-time-display;
     -webkit-user-select: none;
-    -webkit-flex: none;
-    display: -webkit-flex;
+    flex: none;
+    display: flex;
     border: none;
     cursor: default;
 
     height: 30px;
     margin: 0 9px 0 0;
     padding: 0;
 
     line-height: 30px;
     font-family: Arial, Helvetica, sans-serif;
     font-size: 13px;
     font-weight: bold;
     font-style: normal;
     color: white;
 
     letter-spacing: normal;
     word-spacing: normal;
     text-transform: none;
     text-indent: 0;
     text-shadow: none;
     text-decoration: none;
 }
 
 audio::-webkit-media-controls-timeline, video::-webkit-media-controls-timeline {
     -webkit-appearance: media-slider;
-    display: -webkit-flex;
-    -webkit-flex: 1 1 auto;
+    display: flex;
+    flex: 1 1 auto;
     height: 8px;
     margin: 0 15px 0 0;
     padding: 0;
     background-color: transparent;
     min-width: 25px;
     border: initial;
     color: inherit;
 }
 
 audio::-webkit-media-controls-volume-slider, video::-webkit-media-controls-volume-slider {
     -webkit-appearance: media-volume-slider;
-    display: -webkit-flex;
+    display: flex;
     /* The 1.9 value was empirically chosen to match old-flexbox behaviour
      * and be aesthetically pleasing.
      */
-    -webkit-flex: 1 1.9 auto;
+    flex: 1 1.9 auto;
     height: 8px;
     max-width: 70px;
     margin: 0 15px 0 0;
     padding: 0;
     background-color: transparent;
     min-width: 15px;
     border: initial;
     color: inherit;
 }
 
 /* FIXME these shouldn't use special pseudoShadowIds, but nicer rules.
    https://code.google.com/p/chromium/issues/detail?id=112508
    https://bugs.webkit.org/show_bug.cgi?id=62218
 */
 input[type="range"]::-webkit-media-slider-container {
-    display: -webkit-flex;
-    -webkit-align-items: center;
-    -webkit-flex-direction: row; /* This property is updated by C++ code. */
+    display: flex;
+    align-items: center;
+    flex-direction: row; /* This property is updated by C++ code. */
     box-sizing: border-box;
     height: 100%;
     width: 100%;
     border: 1px solid rgba(230, 230, 230, 0.35);
     border-radius: 4px;
     background-color: transparent; /* Background drawing is managed by C++ code to draw ranges. */
 }
 
 /* The negative right margin causes the track to overflow its container. */
 input[type="range"]::-webkit-media-slider-container > div {
     margin-right: -14px;
 }
 
 input[type="range"]::-webkit-media-slider-thumb {
     margin-left: -7px;
     margin-right: -7px;
 }
 
 audio::-webkit-media-controls-seek-back-button, video::-webkit-media-controls-seek-back-button {
     -webkit-appearance: media-seek-back-button;
-    display: -webkit-flex;
+    display: flex;
     width: 16px;
     height: 16px;
     background-color: initial;
     border: initial;
     color: inherit;
 }
 
 audio::-webkit-media-controls-seek-forward-button, video::-webkit-media-controls-seek-forward-button {
     -webkit-appearance: media-seek-forward-button;
-    display: -webkit-flex;
+    display: flex;
     width: 16px;
     height: 16px;
     background-color: initial;
     border: initial;
     color: inherit;
 }
 
 audio::-webkit-media-controls-fullscreen-button, video::-webkit-media-controls-fullscreen-button {
     -webkit-appearance: media-enter-fullscreen-button;
-    display: -webkit-flex;
-    -webkit-flex: none;
+    display: flex;
+    flex: none;
     border: none;
     box-sizing: border-box;
     width: 30px;
     height: 30px;
     line-height: 30px;
     margin-left: -5px;
     margin-right: 9px;
     padding: 0;
     background-color: initial;
     color: inherit;
 }
 
 audio::-webkit-media-controls-rewind-button, video::-webkit-media-controls-rewind-button {
     display: none;
     background-color: initial;
     border: initial;
     color: inherit;
 }
 
 audio::-webkit-media-controls-return-to-realtime-button, video::-webkit-media-controls-return-to-realtime-button {
     display: none;
     background-color: initial;
     border: initial;
     color: inherit;
 }
 
 audio::-webkit-media-controls-toggle-closed-captions-button, video::-webkit-media-controls-toggle-closed-captions-button {
     -webkit-appearance: media-toggle-closed-captions-button;
-    display: -webkit-flex;
-    -webkit-flex: none;
+    display: flex;
+    flex: none;
     border: none;
     box-sizing: border-box;
     width: 30px;
     height: 30px;
     line-height: 30px;
     margin-left: -5px;
     margin-right: 9px;
     padding: 0;
     background-color: initial;
     color: inherit;
@@ skipping 31 matching lines @@
 
     letter-spacing: normal;
     word-spacing: normal;
     text-transform: none;
     text-indent: 0;
     text-decoration: none;
     pointer-events: none;
     -webkit-user-select: none;
     word-break: break-word;
 
-    -webkit-flex: 1 1;
+    flex: 1 1;
 }
 
 video::cue {
     display: inline;
 
     background-color: rgba(0, 0, 0, 0.8);
     padding: 2px 2px;
 }
 
 video::-webkit-media-text-track-region {
     position: absolute;
     line-height: 5.33vh;
     writing-mode: horizontal-tb;
     background: rgba(0, 0, 0, 0.8);
     color: rgba(255, 255, 255, 1);
     word-wrap: break-word;
     overflow-wrap: break-word;
     overflow: hidden;
 }
 
 video::-webkit-media-text-track-region-container {
     position: relative;
 
-    display: -webkit-flex;
-    -webkit-flex-flow: column;
-    -webkit-flex-direction: column;
+    display: flex;
+    flex-flow: column;
+    flex-direction: column;
 }
 
 video::-webkit-media-text-track-region-container.scrolling {
     transition: top 433ms linear;
 }
 
 
 video::-webkit-media-text-track-display {
     position: absolute;
     overflow: hidden;
     white-space: pre-wrap;
     -webkit-box-sizing: border-box;
-    -webkit-flex: 0 0 auto;
+    flex: 0 0 auto;
 }
 
 video::cue(:future) {
     color: gray;
 }
 
 video::-webkit-media-text-track-container b {
     font-weight: bold;
 }
 
 video::-webkit-media-text-track-container u {
     text-decoration: underline;
 }
 
 video::-webkit-media-text-track-container i {
     font-style: italic;
 }