Convert Chromoting to use the new, non-deprecated flexbox

remoting/webapp/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;
@@ skipping 26 matching lines @@
 }
 
 .toolbar-border {
   border-radius: 7px;
   border: 3px solid #4695ff;
   width: 620px;
   padding: 10px 7px 5px 7px;
   background-color: #e9e9e9;
   box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.5);
   pointer-events: all;
-  display: -webkit-box;
+  display: -webkit-flex;
 }
 
 .toolbar-border > div {
   margin: 4px;
 }
 
 /* Ensure that the 'connected to' string doesn't make the tool-bar overflow */
 #connected-to {
   max-width: 280px;
   overflow: hidden;
@@ skipping 24 matching lines @@
 }
 
 
 .toolbar-stub:hover .arrow-down {
   opacity: 1.0;
 }
 
 .toolbar-visible .arrow-down {
   -webkit-transform: rotate(180deg);
 }