Minor CSS cleanup.

chrome/browser/resources/options/extension_settings.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.
 */
 
-/* TODO(finnur): Move these into a central location, either options_page.css or
-                 somewhere in the shared directory */
-.hbox {
-  display: -webkit-box;
-  -webkit-box-orient: horizontal;
-}
-
-.vbox {
-  display: -webkit-box;
-  -webkit-box-orient: vertical;
-}
-
-.stretch {
+.details-view {
   padding-right: 10px;
-  -webkit-box-flex: 1;
 }
 
 .extension-list-item {
   padding-bottom: 7px;
   padding-top: 7px;
   width: 100%;
   -webkit-user-select: auto;
 }
 
 /* Get rid of display: table, which causes width issues. */
@@ skipping 221 matching lines @@
 
 #get-more-extensions-container {
   display: -webkit-box;
 }
 
 #get-more-extensions {
   padding-left: 10px;
   padding-top: 5px;
   font-size: 15px;
 }