[BackgroundSync Cleanup] Remove power observer

content/browser/background_sync/background_sync_manager.h

Index: content/browser/background_sync/background_sync_manager.h
diff --git a/content/browser/background_sync/background_sync_manager.h b/content/browser/background_sync/background_sync_manager.h
index 42a69ea89897e86e36a528486c80b752673f9587..5f1c7620c7bae3f292fb1ea69cc996ea5237adaa 100644
--- a/content/browser/background_sync/background_sync_manager.h
+++ b/content/browser/background_sync/background_sync_manager.h
@@ -37,7 +37,6 @@
 namespace content {
 
 class BackgroundSyncNetworkObserver;
-class BackgroundSyncPowerObserver;
 class ServiceWorkerContextWrapper;
 
 // BackgroundSyncManager manages and stores the set of background sync
@@ -362,7 +361,6 @@ class CONTENT_EXPORT BackgroundSyncManager
   void OnStorageWipedImpl(const base::Closure& callback);
 
   void OnNetworkChanged();
-  void OnPowerChanged();
 
   // SetMaxSyncAttempts callback
   void SetMaxSyncAttemptsImpl(int max_sync_attempts,
@@ -404,7 +402,6 @@ class CONTENT_EXPORT BackgroundSyncManager
   base::CancelableCallback<void()> delayed_sync_task_;
 
   scoped_ptr<BackgroundSyncNetworkObserver> network_observer_;
-  scoped_ptr<BackgroundSyncPowerObserver> power_observer_;
 
   // The registrations that clients have handles to.
   IDMap<scoped_refptr<RefCountedRegistration>,