Attempt to fix win7 about flags relaunch rendering.

chrome/browser/resources/flags.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. */
 
 body {
   margin: 10px 10px 0;
 <if expr="not is_android and not is_ios">
   min-width: 47em;
 </if>
   /* Should be larger than the evaluated height of needs-restart. */
@@ skipping 151 matching lines @@
   margin-bottom: 0.2em;
   margin-top: 0.2em;
 }
 
 div.needs-restart {
   /* If you modify properties that change the height of this,
    * update body.padding-bottom. */
   background: #FFF;
   border-top: 1px solid rgb(181, 199, 222);
   bottom: 0;
+  box-shadow: 0 -2px 2px #ddd;
   box-sizing: border-box;
   left: 0;
   padding-bottom: 15px;
   padding-left: 15px;
   padding-right: 15px;
   padding-top: 15px;
   position: fixed;
   width: 100%;
 }
 
 .experiment-restart-button {
   -webkit-user-select: none;
   background: rgb(76, 142, 250);
   border: 0;
   border-radius: 2px;
   box-sizing: border-box;
   color: #fff;
   cursor: pointer;
-  font-size: .875em;
-  font-weight: 600;
+  font-weight: 700;
   margin-top: 10px;
   padding: 10px 24px;
   text-transform: uppercase;
   transition: box-shadow 200ms cubic-bezier(0.4, 0, 0.2, 1);
 }
 
 button {
   font-size: 104%;
 }