Reduce webkit CSS prefixes in ui/ styles

ui/login/account_picker/screen_account_picker.js

 // Copyright 2014 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.
 
 /**
  * @fileoverview Account picker screen implementation.
  */
 
 login.createScreen('AccountPickerScreen', 'account-picker', function() {
   /**
@@ skipping 232 matching lines @@
           if (maxHeight < bubbleOffsetHeight)
             attachment = cr.ui.Bubble.Attachment.TOP;
         } else {
           // Move error bubble if it doesn't fit screen.
           if (maxWidth < bubbleOffsetWidth) {
             bubblePositioningPadding = 2;
             attachment = cr.ui.Bubble.Attachment.LEFT;
           }
         }
         var showBubbleCallback = function() {
-          activatedPod.removeEventListener("webkitTransitionEnd",
+          activatedPod.removeEventListener("transitionend",
               showBubbleCallback);
           $('bubble').showContentForElement(bubbleAnchor,
                                             attachment,
                                             error,
                                             BUBBLE_OFFSET,
                                             bubblePositioningPadding, true);
         };
-        activatedPod.addEventListener("webkitTransitionEnd",
+        activatedPod.addEventListener("transitionend",
                                       showBubbleCallback);
         ensureTransitionEndEvent(activatedPod);
       }
     },
 
     /**
      * Loads the PIN keyboard if any of the users can login with a PIN. Disables
      * the PIN keyboard for users who are not allowed to use PIN unlock.
      * @param {array} users Array of user instances.
      */
@@ skipping 205 matching lines @@
      * @param {string} userID The user ID of the public session
      * @param {string} locale The locale to which this list of keyboard layouts
      *     applies
      * @param {!Object} list List of available keyboard layouts
      */
     setPublicSessionKeyboardLayouts: function(userID, locale, list) {
       $('pod-row').setPublicSessionKeyboardLayouts(userID, locale, list);
     }
   };
 });