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 291 matching lines @@
 }
 
 .profile-is-managed-banner .page-banner-text {
   background-image: url('chrome://theme/IDR_WARNING');
 }
 
 .profile-is-managed .more-extensions-link {
   display: none;
 }
 
+.profile-is-managed .extension-commands-config {

[Bernhard Bauer, 2013/02/19 18:19:16]

You can combine all of these selectors for display: none.

+  display: none;
+}
+
+#managed-user-control-div {
+  display: inline-block;
+  padding-left: 7px;
+}
+
+.no-managed-user-controls #managed-user-control-div {
+  display: none;
+}
+
+.page:not(.profile-is-managed) #unlock-button {
+  display: none;
+}
+
+.profile-is-managed #lock-button {
+  display: none;
+}
+
 /* Sideload Wipeout */
 
 .sideload-wipeout-learn-more {
   text-decoration: none;
 }
 
 .sideload-wipeout-banner .page-banner-text {
   -webkit-padding-start: 8px;
   background-image: none;
 }