[Clean up] Fix style guide nits in chrome/browser/resources/ntp4.

chrome/browser/resources/ntp4/apps_page.css

 /* 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. */
 
 .app {
   outline: none;
   position: absolute;
   text-align: center;
 }
 
@@ skipping 17 matching lines @@
 
 .app-contents > span {
   display: block;
   overflow: hidden;
   text-decoration: none;
   text-overflow: ellipsis;
   white-space: nowrap;
 }
 
 .app-img-container {
+  /* -webkit-mask-image set by JavaScript to the image source. */
+  -webkit-mask-size: 100% 100%;
   margin-left: auto;
   margin-right: auto;
-  /* -webkit-mask-image set by JavaScript to the image source */
-  -webkit-mask-size: 100% 100%;
 }
 
 .app-img-container > * {
   height: 100%;
   width: 100%;
 }
 
 .app-icon-div {
+  -webkit-box-align: center;
+  -webkit-box-pack: center;
   background-color: white;
   border: 1px solid #d5d5d5;
   border-radius: 5px;
   display: -webkit-box;
   margin-left: auto;
   margin-right: auto;
   position: relative;
   vertical-align: middle;
   z-index: 0;
-  -webkit-box-align: center;
-  -webkit-box-pack: center;
 }
 
 .app-icon-div .app-img-container {
   bottom: 10px;
   left: 10px;
   position: absolute;
 }
 
 .app-icon-div .color-stripe {
   border-bottom-left-radius: 5px 5px;
@@ skipping 14 matching lines @@
   z-index: 1000;
 }
 
 .launch-click-target {
   cursor: pointer;
 }
 
 /* Notifications */
 
 .app-notification {
+  -webkit-transition: color 150ms linear;
   color: #999;
   display: block;
   font-size: 11px;
   white-space: nowrap;
-  -webkit-transition: color 150ms linear;
 }
 
 .app-notification:hover {
   text-decoration: underline;
 }
 
 /* Promo */
 /* Show the promo if the webstore has a promo and is the only app on the page.
  */
 .tile:only-of-type > .has-promo > .app-contents > span {
@@ skipping 31 matching lines @@
   text-align: left;
   top: 0;
 }
 
 html[dir='rtl'] .apps-promo-extras {
   left: auto;
   right: 160px;
 }
 
 .apps-promo-heading {
+  -webkit-margin-start: 3px;
   font-weight: bold;
   margin-bottom: 5px;
-  -webkit-margin-start: 3px;
 }
 
 .g-button-basic {
+  -webkit-border-image: url('images/app_promo_button.png') 6 10 12 6;
   border-width: 6px 10px 12px 6px;
   color: #fff !important;
   display: inline-block;
   font-size: 1.3em;
   font-weight: bold;
   padding: 2px 10px;
   text-align: center;
   text-decoration: none;
   white-space: nowrap;
-  -webkit-border-image: url('images/app_promo_button.png') 6 10 12 6;
 }
 
 .app .invisible {
   visibility: hidden;
 }
 
 /* App install hint */
 
 .app-install-hint {
   -webkit-transition: opacity 150ms;
@@ skipping 28 matching lines @@
   width: 12%;
 }
 
 .app-install-hint-interior > div:first-child {
   -webkit-transform: rotate(90deg);
 }
 
 html.dragging-mode .app-install-hint {
   opacity: 0;
 }