Removing PrefObserver usage, batch 4.

chrome/browser/extensions/api/managed_mode/managed_mode_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.
 
 // Implementation of the Chrome Extensions Managed Mode API.
 
 #include "chrome/browser/extensions/api/managed_mode/managed_mode_api.h"
 
 #include <string>
 
@@ skipping 24 matching lines @@
 
 }  // namespace
 
 namespace keys = extensions::preference_api_constants;
 
 namespace extensions {
 
 ExtensionManagedModeEventRouter::ExtensionManagedModeEventRouter(
     Profile* profile) : profile_(profile) {
   registrar_.Init(g_browser_process->local_state());
-  registrar_.Add(prefs::kInManagedMode, this);
+  registrar_.Add(
+      prefs::kInManagedMode,
+      base::Bind(&ExtensionManagedModeEventRouter::OnInManagedModeChanged,
+                 base::Unretained(this)));
 }
 
 ExtensionManagedModeEventRouter::~ExtensionManagedModeEventRouter() {
 }
 
-void ExtensionManagedModeEventRouter::OnPreferenceChanged(
-    PrefServiceBase* service,
-    const std::string& pref_name) {
-  DCHECK_EQ(std::string(prefs::kInManagedMode), pref_name);
-
+void ExtensionManagedModeEventRouter::OnInManagedModeChanged() {
   DictionaryValue* dict = new DictionaryValue();
   dict->SetBoolean(
       keys::kValue,
       g_browser_process->local_state()->GetBoolean(prefs::kInManagedMode));
   scoped_ptr<ListValue> args(new ListValue());
   args->Set(0, dict);
 
   extensions::EventRouter* event_router =
       extensions::ExtensionSystem::Get(profile_)->event_router();
   event_router->DispatchEventToRenderers(kChangeEventName, args.Pass(), NULL,
@@ skipping 52 matching lines @@
   EXTENSION_FUNCTION_VALIDATE(args_->Get(1, &value));
 #if defined(ENABLE_CONFIGURATION_POLICY)
   policy::ManagedModePolicyProvider* policy_provider =
       profile_->GetManagedModePolicyProvider();
   policy_provider->SetPolicy(key, value);
 #endif
   return true;
 }
 
 }  // namespace extensions