Add management policy function allowing extensions to be disabled.

chrome/browser/extensions/api/management/management_api.cc

 // 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.
 
 #include "chrome/browser/extensions/api/management/management_api.h"
 
 #include <map>
 #include <string>
 #include <vector>
 
@@ skipping 453 matching lines @@
 
   const Extension* extension = service()->GetInstalledExtension(extension_id_);
   if (!extension || extension->ShouldNotBeVisible()) {
     error_ = ErrorUtils::FormatErrorMessage(
         keys::kNoExtensionError, extension_id_);
     return false;
   }
 
   const ManagementPolicy* policy =
       ExtensionSystem::Get(GetProfile())->management_policy();
-  if (!policy->UserMayModifySettings(extension, NULL)) {
+  if (!policy->UserMayModifySettings(extension, NULL) ||
+      (!params->enabled && policy->MustRemainEnabled(extension, NULL)) ||
+      (params->enabled && policy->MustRemainDisabled(extension, NULL, NULL))) {
     error_ = ErrorUtils::FormatErrorMessage(
         keys::kUserCantModifyError, extension_id_);
     return false;
   }
 
   bool currently_enabled = service()->IsExtensionEnabled(extension_id_);
 
   if (!currently_enabled && params->enabled) {
     ExtensionPrefs* prefs = service()->extension_prefs();
     if (prefs->DidExtensionEscalatePermissions(extension_id_)) {
@@ skipping 238 matching lines @@
 ProfileKeyedAPIFactory<ManagementAPI>* ManagementAPI::GetFactoryInstance() {
   return &g_factory.Get();
 }
 
 void ManagementAPI::OnListenerAdded(const EventListenerInfo& details) {
   management_event_router_.reset(new ManagementEventRouter(profile_));
   ExtensionSystem::Get(profile_)->event_router()->UnregisterObserver(this);
 }
 
 }  // namespace extensions