Use mojo to connect to BackgroundSyncManager object

content/child/blink_platform_impl.h

Index: content/child/blink_platform_impl.h
diff --git a/content/child/blink_platform_impl.h b/content/child/blink_platform_impl.h
index d19caa5a90d87f07dbca7a93532ffdac2d809c98..29c15ccb3864ee3f86c2b882e8c6e75052fc37c2 100644
--- a/content/child/blink_platform_impl.h
+++ b/content/child/blink_platform_impl.h
@@ -33,7 +33,6 @@ class MessageLoop;
 }
 
 namespace content {
-class BackgroundSyncProvider;
 class FlingCurveConfiguration;
 class NotificationDispatcher;
 class PermissionDispatcher;
@@ -203,7 +202,6 @@ class CONTENT_EXPORT BlinkPlatformImpl
   scoped_refptr<NotificationDispatcher> notification_dispatcher_;
   scoped_refptr<PushDispatcher> push_dispatcher_;
   scoped_ptr<PermissionDispatcher> permission_client_;
-  scoped_ptr<BackgroundSyncProvider> sync_provider_;
 };
 
 }  // namespace content