Eliminate NOTIFICATION_HISTORY_LOADED notification

components/history/core/browser/history_service_observer.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_OBSERVER_H_
 #define COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_OBSERVER_H_
 
 #include "base/macros.h"
 #include "components/history/core/browser/history_types.h"
 
@@ skipping 24 matching lines @@
   // |changed_urls| lists the information for each of the URLs affected. The
   // rows will have the IDs that are currently in effect in the main history
   // database.
   virtual void OnURLsModified(HistoryService* history_service,
                               const URLRows& changed_urls) {}
 
   // Called on changes to the VisitDatabase.
   virtual void OnAddVisit(HistoryService* history_service,
                           const BriefVisitInfo& info) {}
 
+  // Is called to notify when |history_service| has finished loading.
+  virtual void OnHistoryServiceLoaded(HistoryService* history_service) {}
+
+  // Is called to notify when |history_service| is being deleted.
+  virtual void HistoryServiceBeingDeleted(HistoryService* history_service) {}
+
  private:
   DISALLOW_COPY_AND_ASSIGN(HistoryServiceObserver);
 };
 
 }  // namespace history
 
 #endif  // COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_SERVICE_OBSERVER_H_