Add managed user lock/unlock button for the extensions page.

chrome/browser/resources/extensions/extensions.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. */
 
 html.loading * {
   -webkit-transition-duration: 0 !important;
 }
 
 /* Developer mode */
 
@@ skipping 279 matching lines @@
   border-radius: 3px;
   padding: 5px 0 5px 5px;
 }
 
 .may-not-disable .optional-controls .optional-controls-disableable {
   display: none;
 }
 
 /* Managed mode */
 
-.page:not(.profile-is-managed) .profile-is-managed-banner {
+.page:not(.managed-user-locked) .profile-is-managed-banner,
+.managed-user-locked .more-extensions-link,
+.page:not(.profile-is-managed) #managed-user-control-div,
+.page:not(.managed-user-locked) #unlock-button,
+.managed-user-locked #lock-button {

[not at google - send to devlin, 2013/02/21 16:25:24]

cool, that is much clearer. thanks!

   display: none;
 }
 
 .profile-is-managed-banner .page-banner-text {
   background-image: url('chrome://theme/IDR_WARNING');
 }
 
-.profile-is-managed .more-extensions-link {
-  display: none;
+#managed-user-control-div {
+  display: inline-block;
+  padding-left: 7px;
 }
 
 /* Sideload Wipeout */
 
 .sideload-wipeout-learn-more {
   text-decoration: none;
 }
 
 .sideload-wipeout-banner .page-banner-text {
   -webkit-padding-start: 8px;
   background-image: none;
 }