Eliminate NOTIFICATION_HISTORY_LOADED notification

chrome/browser/history/in_memory_url_index.h

 // Copyright (c) 2012 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 CHROME_BROWSER_HISTORY_IN_MEMORY_URL_INDEX_H_
 #define CHROME_BROWSER_HISTORY_IN_MEMORY_URL_INDEX_H_
 
 #include <functional>
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
+#include "base/scoped_observer.h"
 #include "base/strings/string16.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "chrome/browser/history/history_db_task.h"
 #include "chrome/browser/history/in_memory_url_index_types.h"
 #include "chrome/browser/history/scored_history_match.h"
 #include "components/history/core/browser/history_service_observer.h"
 #include "components/history/core/browser/history_types.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "sql/connection.h"
@@ skipping 211 matching lines @@
                const content::NotificationDetails& details) override;
 
   // HistoryServiceObserver:
   void OnURLVisited(HistoryService* history_service,
                     ui::PageTransition transition,
                     const URLRow& row,
                     const RedirectList& redirects,
                     base::Time visit_time) override;
   void OnURLsModified(HistoryService* history_service,
                       const URLRows& changed_urls) override;
+  void OnHistoryServiceLoaded(HistoryService* history_service) override;
 
   // Notification handlers.
   void OnURLsDeleted(const URLsDeletedDetails* details);
 
   // Sets the directory wherein the cache file will be maintained.
   // For unit test usage only.
   void set_history_dir(const base::FilePath& dir_path) {
     history_dir_ = dir_path;
   }
 
@@ skipping 43 matching lines @@
 
   // Set to true once the index restoration is complete.
   bool restored_;
 
   // Set to true when changes to the index have been made and the index needs
   // to be cached. Set to false when the index has been cached. Used as a
   // temporary safety check to insure that the cache is saved before the
   // index has been destructed.
   bool needs_to_be_cached_;
 
+  ScopedObserver<HistoryService, HistoryServiceObserver>
+      history_service_observer_;
+
   DISALLOW_COPY_AND_ASSIGN(InMemoryURLIndex);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_IN_MEMORY_URL_INDEX_H_