Remove NOTIFICATION_EXTENSION_UNLOADED_DEPRECATED from c/b/e/api

chrome/browser/extensions/api/signed_in_devices/signed_in_devices_manager.h

Index: chrome/browser/extensions/api/signed_in_devices/signed_in_devices_manager.h
diff --git a/chrome/browser/extensions/api/signed_in_devices/signed_in_devices_manager.h b/chrome/browser/extensions/api/signed_in_devices/signed_in_devices_manager.h
index 291347a5e1cc946a64bdcd7b3eb4d41988796ca4..925a6ec5d6de00a4b0a124680b3f6e31575a4076 100644
--- a/chrome/browser/extensions/api/signed_in_devices/signed_in_devices_manager.h
+++ b/chrome/browser/extensions/api/signed_in_devices/signed_in_devices_manager.h
@@ -9,9 +9,11 @@
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_vector.h"
+#include "base/scoped_observer.h"
 #include "chrome/browser/sync/glue/synced_device_tracker.h"
 #include "extensions/browser/browser_context_keyed_api_factory.h"
 #include "extensions/browser/event_router.h"
+#include "extensions/browser/extension_registry_observer.h"
 
 class Profile;
 
@@ -24,6 +26,7 @@ class NotificationRegistrar;
 
 namespace extensions {
 class BrowserContextKeyedAPI;
+class ExtensionRegistry;
 
 struct EventListenerInfo;
 
@@ -54,7 +57,7 @@ class SignedInDevicesChangeObserver
 };
 
 class SignedInDevicesManager : public BrowserContextKeyedAPI,
-                               public content::NotificationObserver,
+                               public ExtensionRegistryObserver,
                                public EventRouter::Observer {
  public:
   // Default constructor used for testing.
@@ -66,10 +69,11 @@ class SignedInDevicesManager : public BrowserContextKeyedAPI,
   static BrowserContextKeyedAPIFactory<SignedInDevicesManager>*
       GetFactoryInstance();
 
-  // NotificationObserver:
-  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:
   virtual void OnListenerAdded(const EventListenerInfo& details) OVERRIDE;
@@ -87,9 +91,12 @@ class SignedInDevicesManager : public BrowserContextKeyedAPI,
   void RemoveChangeObserverForExtension(const std::string& extension_id);
 
   Profile* const profile_;
-  content::NotificationRegistrar registrar_;
   ScopedVector<SignedInDevicesChangeObserver> change_observers_;
 
+  // Listen to extension unloaded notification.
+  ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
+      extension_registry_observer_;
+
   FRIEND_TEST_ALL_PREFIXES(SignedInDevicesManager, UpdateListener);
 
   DISALLOW_COPY_AND_ASSIGN(SignedInDevicesManager);