Clean-up: Change chrome/browser's CSS time units from s to ms.

chrome/browser/resources/sync_promo.css

 /* Copyright (c) 2011 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.
  */
 
 html {
   font-family: segoe ui, arial, helvetica, sans-serif;
   font-size: 13px;
   height: 100%;
 }
@@ skipping 101 matching lines @@
   font-size: 13px;
   line-height: 20px;
 }
 
 #promo-info-pane {
   height: 186px;
   position: relative;
 }
 
 #promo-info-pane > * {
-  -webkit-transition: opacity .2s linear;
+  -webkit-transition: opacity 200ms linear;
   opacity: 1;
   position: absolute;
 }
 
 #promo-info-pane > [hidden] {
   display: inline-block; /* Override default user-agent styles. */
   opacity: 0;
 }