Use ExtensionRegistryObserver instead of deprecated extension notification from c/b/e/api.

chrome/browser/extensions/api/idle/idle_manager.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_IDLE_IDLE_MANAGER_H_
 #define CHROME_BROWSER_EXTENSIONS_API_IDLE_IDLE_MANAGER_H_
 
 #include <map>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/weak_ptr.h"
+#include "base/scoped_observer.h"
 #include "base/threading/thread_checker.h"
 #include "base/timer/timer.h"
 #include "chrome/browser/idle.h"
 #include "components/keyed_service/core/keyed_service.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
 #include "extensions/browser/event_router.h"
+#include "extensions/browser/extension_registry_observer.h"
 
 namespace base {
 class StringValue;
 }  // namespace base
 
 class Profile;
 
 namespace extensions {
+class ExtensionRegistry;
 
 typedef base::Callback<void(IdleState)> QueryStateCallback;
 
 struct IdleMonitor {
   explicit IdleMonitor(IdleState initial_state);
 
   IdleState last_state;
   int listeners;
   int threshold;
 };
 
-class IdleManager : public content::NotificationObserver,
+class IdleManager : public ExtensionRegistryObserver,
                     public EventRouter::Observer,
                     public KeyedService {
  public:
   class IdleTimeProvider {
    public:
     IdleTimeProvider() {}
     virtual ~IdleTimeProvider() {}
     virtual void CalculateIdleState(int idle_threshold,
                                     IdleCallback notify) = 0;
     virtual void CalculateIdleTime(IdleTimeCallback notify) = 0;
@@ skipping 17 matching lines @@
   };
 
   explicit IdleManager(Profile* profile);
   virtual ~IdleManager();
 
   void Init();
 
   // KeyedService implementation.
   virtual void Shutdown() OVERRIDE;
 
-  // content::NotificationDelegate implementation.
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
+  // ExtensionRegistryObserver implementation.
+  virtual void OnExtensionUnloaded(
+      content::BrowserContext* browser_context,
+      const Extension* extension,
+      UnloadedExtensionInfo::Reason reason) OVERRIDE;
 
   // EventRouter::Observer implementation.
   virtual void OnListenerAdded(const EventListenerInfo& details) OVERRIDE;
   virtual void OnListenerRemoved(const EventListenerInfo& details) OVERRIDE;
 
   void QueryState(int threshold, QueryStateCallback notify);
   void SetThreshold(const std::string& extension_id, int threshold);
   static base::StringValue* CreateIdleValue(IdleState idle_state);
 
   // Override default event class. Callee assumes ownership. Used for testing.
@@ skipping 26 matching lines @@
   void UpdateIdleState();
   void UpdateIdleStateCallback(int idle_time);
 
   Profile* profile_;
 
   IdleState last_state_;
   MonitorMap monitors_;
 
   base::RepeatingTimer<IdleManager> poll_timer_;
   base::WeakPtrFactory<IdleManager> weak_factory_;
-  content::NotificationRegistrar registrar_;
 
   scoped_ptr<IdleTimeProvider> idle_time_provider_;
   scoped_ptr<EventDelegate> event_delegate_;
 
   base::ThreadChecker thread_checker_;
 
+  // Listen to extension unloaded notification.
+  ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
+      extension_registry_observer_;
+
   DISALLOW_COPY_AND_ASSIGN(IdleManager);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_IDLE_IDLE_MANAGER_H_