Implement new overlay style for options pages.

chrome/browser/resources/options2/options_page.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 {
   position: relative;
 }
 
 #main-content {
   bottom: 0;
@@ skipping 170 matching lines @@
 
 .managed-prefs-banner.clickable:active .managed-prefs-text {
   background: -webkit-linear-gradient(rgb(250, 230, 145),
                                       rgb(255, 242, 183));
 }
 
 #page-container .page.showing-banner {
   margin-top: 45px;
 }
 
-.overlay .page h1 {
-  background: -webkit-linear-gradient(white, #F8F8F8);
-  border-bottom: 1px solid rgba(188, 193, 208, .5);
-  font-size: 105%;
-  font-weight: bold;
-  padding: 10px 15px 8px 15px;
-}
-
 .page list {
   /* Min height is a multiple of the list item height (32) */
   min-height: 192px;
 }
 
 section {
   -webkit-padding-start: 18px;
   margin-bottom: 24px;
   margin-top: 8px;
   max-width: 600px;
@@ skipping 387 matching lines @@
       url('chrome://theme/IDR_CONTROLLED_SETTING_RECOMMENDED_LARGE');
 }
 
 html[dir='rtl'] .controlled-setting-bubble-text {
   background-position: right top;
 }
 
 .controlled-setting-bubble-action {
   padding: 0 !important;
 }