Reduce usage of webkit CSS prefixes in chrome/browser/resources

chrome/browser/resources/print_preview/previewarea/preview_area.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. */
 
 #preview-area.preview-area {
   -webkit-box-flex: 1;
   -webkit-user-select: none;
   background-color: #e6e6e6;
   overflow: hidden;
   position: relative;
 }
 
 .preview-area-plugin-wrapper {
   height: 100%;
   position: absolute;
   width: 100%;
 }
 
 #preview-area .preview-area-plugin {
-  /* pluginFadeInTransitionDuration = 200ms */
-  -webkit-transition: opacity 200ms linear;
-  /* pluginFadeInTransitionDelay = overlayFadeOutTransitionDuration = 100ms */
-  -webkit-transition-delay: 100ms;
   border: none;
   cursor: inherit;
   height: 100%;
   opacity: 1;
+  /* pluginFadeInTransitionDuration = 200ms */
+  transition: opacity 200ms linear;
+  /* pluginFadeInTransitionDelay = overlayFadeOutTransitionDuration = 100ms */
+  transition-delay: 100ms;
   width: 100%;
 }
 
 #preview-area .preview-area-plugin.invisible {
+  opacity: 0;
   /* pluginFadeOutTransitionDuration = 100ms */
-  -webkit-transition: opacity 100ms linear;
+  transition: opacity 100ms linear;
   /* pluginFadeOutTransitionDelay = 250ms */
-  -webkit-transition-delay: 250ms;
-  opacity: 0;
+  transition-delay: 250ms;
 }
 
 #preview-area .preview-area-overlay-layer {
-  -webkit-transition: opacity 200ms linear;
-  /* overlayFadeInTransitionDelay = pluginFadeOutTransitionDelay +
-   *     pluginFadeOutTransitionDuration = 350ms */
-  -webkit-transition-delay: 350ms;
   -webkit-user-select: none;
   background: #e6e6e6;
   height: 100%;
   margin: 0;
   opacity: 1;
   position: absolute;
+  transition: opacity 200ms linear;
+  /* overlayFadeInTransitionDelay = pluginFadeOutTransitionDelay +
+   *     pluginFadeOutTransitionDuration = 350ms */
+  transition-delay: 350ms;
   width: 100%;
   z-index: 1;
 }
 
 #preview-area .preview-area-overlay-layer.invisible {
-  /* overlayFadeOutTransitionDuration = 100ms */
-  -webkit-transition: opacity 100ms linear;
   opacity: 0;
   pointer-events: none;
+  /* overlayFadeOutTransitionDuration = 100ms */
+  transition: opacity 100ms linear;
 }
 
 #preview-area .preview-area-messages {
   height: 100%;
 }
 
 #preview-area .preview-area-message {
   color: #404040;
   font-size: 1.1em;
   position: relative;
   text-align: center;
   text-shadow: 0 1px 0 rgba(255, 255, 255, .5);
   top: 50%;
 }
 
 #preview-area .preview-area-no-plugin-action-area {
   margin-top: 12px;
 }
 
 #preview-area .preview-area-open-system-dialog-button-throbber {
   vertical-align: middle;
 }