[WebUI] Fix rest of CSS style nits so I can turn on CSS checker.

chrome/browser/resources/file_manager/css/combobutton.css

-/*
- * Copyright (c) 2012 The Chromium Authors. All rights reserved.
+/* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
-
 .cr-button {
   -webkit-appearance: none;
   -webkit-user-select: none;
   background-image: -webkit-linear-gradient(#ededed, #ededed 38%, #dedede);
+  border: 1px solid rgba(0, 0, 0, 0.25);
   border-radius: 2px;
-  border: 1px solid rgba(0, 0, 0, 0.25);
   box-shadow: 0 1px 0 rgba(0, 0, 0, 0.08),
       inset 0 1px 2px rgba(255, 255, 255, 0.75);
   color: #444;
+  cursor: default;
   font: -webkit-small-control;
   margin: 0 1px 0 0;
   text-shadow: 0 1px 0 rgb(240, 240, 240);
-  cursor: default;
 }
 
 .cr-button:hover {
   background-image: -webkit-linear-gradient(#f0f0f0, #f0f0f0 38%, #e0e0e0);
   border-color: rgba(0, 0, 0, 0.3);
   box-shadow: 0 1px 0 rgba(0, 0, 0, 0.12),
       inset 0 1px 2px rgba(255, 255, 255, 0.95);
   color: black;
 }
 
 .cr-button:active {
   background-image: -webkit-linear-gradient(#e7e7e7, #e7e7e7 38%, #d7d7d7);
   box-shadow: none;
   text-shadow: none;
 }
 
 .cr-button:disabled {
   border-color: rgba(0, 0, 0, 0.2);
   color: #999;
 }
 
 .cr-button:focus {
   -webkit-transition: border-color 200ms;
   border-color: rgb(77, 144, 254);
   outline: none;
 }
 
 
 .cr-combobutton {
-  position: relative;
+  cursor: default;
   display: none;
   font: -webkit-small-control;
-  cursor: default;
+  position: relative;
 }
 
 .cr-combobutton[visible] {
+  -webkit-box-align: stretch;
+  -webkit-box-orient: vertical;
   display: -webkit-box;
-  -webkit-box-orient: vertical;
-  -webkit-box-align: stretch;
 }
 
 .cr-cb-container {
   -webkit-box-flex: 1;
   display: -webkit-box;
 }
 
 .cr-cb-button-container {
+  -webkit-box-align: stretch;
   -webkit-box-flex: 1;
+  -webkit-box-orient: vertical;
+  border-bottom-right-radius: 0;
+  border-top-right-radius: 0;
   display: -webkit-box;
-  -webkit-box-orient: vertical;
-  -webkit-box-align: stretch;
-  border-top-right-radius: 0px;
-  border-bottom-right-radius: 0px;
 }
 
 .cr-cb-button-container > * {
   background-color: rgba(0, 0, 0, 0);
 }
 
 .cr-cb-trigger {
   -webkit-box-flex: 0;
   -webkit-margin-start: -1px;
+  border-bottom-left-radius: 0;
+  border-top-left-radius: 0;
+  display: none;
+  margin-left: -2px;
   width: 20px;
-  display: none;
-  border-top-left-radius: 0px;
-  border-bottom-left-radius: 0px;
-  margin-left: -2px;
 }
 
 .cr-cb-trigger > img {
   content: url('../images/disclosure_arrow_dk_grey_down.png');
   margin-left: 6px;
   margin-top: 13px;
 }
 
 .cr-combobutton[multiple] .cr-cb-trigger {
   display: block;
 }
 
 .cr-cb-popup {
+  -webkit-box-align: stretch;
+  -webkit-box-orient: vertical;
+  -webkit-box-shadow: 0 2px 4px rgba(0, 0, 0, .50);
+  background: white;
+  border: 1px solid rgba(0, 0, 0, 0.25);
+  border-radius: 2px;
+  box-sizing: border-box;
+  color: black;
+  cursor: default;
+  display: -webkit-box;
+  opacity: 0;
+  padding:  8px 0;
+  pointer-events: none;
   position: absolute;
   right: 1px;
-  display: -webkit-box;
-  opacity: 0;
-  pointer-events: none;
-  -webkit-box-orient: vertical;
-  -webkit-box-align: stretch;
-  box-sizing: border-box;
-
-  -webkit-box-shadow: 0 2px 4px rgba(0, 0, 0, .50);
-  background: white;
-  color: black;
-  cursor: default;
   white-space: nowrap;
-  border-radius: 2px;
-  border: 1px solid rgba(0, 0, 0, 0.25);
-  padding:  8px 0;
 }
 
 .cr-cb-popup:active {
-  box-shadow: inset 0px 1px 2px rgba(0, 0, 0, 0.1);
+  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
 }
 
 .cr-combobutton[open] .cr-cb-popup {
   opacity: 1;
   pointer-events: auto;
 }
 
 .cr-cb-popup > * {
   background: transparent;
   border: 0;
   font: inherit;
   overflow: hidden;
   text-overflow: ellipsis;
 }
 
 .cr-cb-popup > *:hover {
-  background-color: #dce5fa;
+  background-color: rgb(220, 229, 250);
 }
 
 .cr-cb-popup > *:active {
-  background-color: #426dc9;
+  background-color: rgb(66, 109, 201);
   color: #fff;
 }