Add shutdown notification and service refs to SyncServiceObserver.

chrome/browser/ui/webui/foreign_session_handler.h

Index: chrome/browser/ui/webui/foreign_session_handler.h
diff --git a/chrome/browser/ui/webui/foreign_session_handler.h b/chrome/browser/ui/webui/foreign_session_handler.h
index d41d0ec3791ebca937b526c33af71599579c5524..d0cb2452b0368f05f3f74a205bcd5f07a9c129cb 100644
--- a/chrome/browser/ui/webui/foreign_session_handler.h
+++ b/chrome/browser/ui/webui/foreign_session_handler.h
@@ -57,9 +57,8 @@ class ForeignSessionHandler : public content::WebUIMessageHandler,
 
  private:
   // syncer::SyncServiceObserver:
-  void OnStateChanged() override {}
-  void OnSyncConfigurationCompleted() override;
-  void OnForeignSessionUpdated() override;
+  void OnSyncConfigurationCompleted(syncer::SyncService* sync) override;
+  void OnForeignSessionUpdated(syncer::SyncService* sync) override;
 
   // Returns a string used to show the user when a session was last modified.
   base::string16 FormatSessionTime(const base::Time& time);