Settings: Clean up browser_options page according to style guide.

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 {
   display: -webkit-box;
@@ skipping 209 matching lines @@
 .subpage-sheet-container {
   -webkit-transition: 250ms opacity, 100ms padding-left, 100ms padding-right;
   box-sizing: border-box;
   min-height: 100%;
   position: absolute;
   left: 0;
   right: 0;
   top: 0;
 }
 
-/* Omit top padding (currently only on #browserPage) whenever the search page is
- * showing. */
-#searchPage:not([hidden]) + #browserPage {
+/* Omit top padding (currently only on #settings) whenever the search page is
+ * showing.
+ */
+#searchPage:not([hidden]) + #settings {
   padding-top: 0;
 }
 
 #subpage-sheet-container-1 {
   -webkit-padding-start: 40px;
   z-index: 5;
 }
 
 #subpage-sheet-container-2 {
   -webkit-padding-start: 80px;
@@ skipping 493 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;
 }