[AppRemoting] Reduce usage of webkit prefix

remoting/webapp/crd/html/toolbar.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.
  */
 
 .toolbar-container {
   position: fixed;
   top: -48px;
   width: 640px;
-  -webkit-transition: top 0.15s ease;
+  transition: top 0.15s ease;
   font-size: 13px;
   pointer-events: none;
   z-index: 1;
 }
 
 .toolbar-visible {
   top: -8px;
 }
 
 .toolbar-stub {
   position: absolute;
   width: 134px;
   height: 7px;
   left: 243px;
   border-bottom-left-radius: 7px;
   border-bottom-right-radius: 7px;
   background-color: #4695ff;
   box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.5);
   pointer-events: all;
   clip: rect(0, 999px, 999px, -999px);
-  -webkit-transition: height 0.15s ease;
+  transition: height 0.15s ease;
 }
 
 .toolbar-stub-extended,
 .toolbar-visible .toolbar-stub {
   height: 14px;
 }
 
 .toolbar-border {
   border-radius: 7px;
   border: 3px solid #4695ff;
@@ skipping 27 matching lines @@
 .arrow-down {
   position: absolute;
   width: 0;
   height: 0;
   border-left: 5px solid transparent;
   border-right: 5px solid transparent;
   border-top: 5px solid white;
   left: 62px;
   bottom: 2px;
   opacity: 0.5;
-  -webkit-transition: bottom 0.15s ease, opacity 0.1s linear;
+  transition: bottom 0.15s ease, opacity 0.1s linear;
 }
 
 .toolbar-stub-extended .arrow-down,
 .toolbar-visible .arrow-down {
   bottom: 6px;
 }
 
 
 .toolbar-stub:hover .arrow-down {
   opacity: 1.0;
 }
 
 .toolbar-visible .arrow-down {
-  -webkit-transform: rotate(180deg);
+  transform: rotate(180deg);
 }