Remove unused code from MessageCenterNotificationManager.

chrome/browser/notifications/message_center_notification_manager.h

Index: chrome/browser/notifications/message_center_notification_manager.h
diff --git a/chrome/browser/notifications/message_center_notification_manager.h b/chrome/browser/notifications/message_center_notification_manager.h
index 918fb11c7222df4a3da4ec530b054eb0526e9667..6ae1ad8aa0e67ff3c1b575c4331218cf11f5d543 100644
--- a/chrome/browser/notifications/message_center_notification_manager.h
+++ b/chrome/browser/notifications/message_center_notification_manager.h
@@ -19,8 +19,6 @@
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/browser/notifications/notification_system_observer.h"
 #include "chrome/browser/notifications/notification_ui_manager.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
 #include "ui/message_center/message_center.h"
 #include "ui/message_center/message_center_observer.h"
 #include "ui/message_center/message_center_tray_delegate.h"
@@ -41,8 +39,7 @@ FORWARD_DECLARE_TEST(WebNotificationTrayTest, ManuallyCloseMessageCenter);
 // of notifications to MessageCenter, doing necessary conversions.
 class MessageCenterNotificationManager
     : public NotificationUIManager,
-      public message_center::MessageCenterObserver,
-      public content::NotificationObserver {
+      public message_center::MessageCenterObserver {
  public:
   MessageCenterNotificationManager(
       message_center::MessageCenter* message_center,
@@ -91,12 +88,6 @@ class MessageCenterNotificationManager
   void SetMessageCenterTrayDelegateForTest(
       message_center::MessageCenterTrayDelegate* delegate);
 
- protected:
-  // content::NotificationObserver override.
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
-
  private:
   FRIEND_TEST_ALL_PREFIXES(message_center::WebNotificationTrayTest,
                            ManuallyCloseMessageCenter);
@@ -236,9 +227,6 @@ class MessageCenterNotificationManager
   // To own the blockers.
   ScopedVector<message_center::NotificationBlocker> blockers_;
 
-  // Registrar for the other kind of notifications (event signaling).
-  content::NotificationRegistrar registrar_;
-
   NotificationSystemObserver system_observer_;
 
   // Keeps track of all notification statistics for UMA purposes.