Remove adapter method on HistoryBackend delegating to AndroidProviderBackend

chrome/browser/history/history_service.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_HISTORY_SERVICE_H_
 #define CHROME_BROWSER_HISTORY_HISTORY_SERVICE_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 420 matching lines @@
   // Observers -----------------------------------------------------------------
 
   // Adds/Removes an Observer.
   void AddObserver(history::HistoryServiceObserver* observer);
   void RemoveObserver(history::HistoryServiceObserver* observer);
 
   // Generic Stuff -------------------------------------------------------------
 
   // Schedules a HistoryDBTask for running on the history backend thread. See
   // HistoryDBTask for details on what this does. Takes ownership of |task|.
-  virtual void ScheduleDBTask(scoped_ptr<history::HistoryDBTask> task,
-                              base::CancelableTaskTracker* tracker);
+  virtual base::CancelableTaskTracker::TaskId ScheduleDBTask(
+      scoped_ptr<history::HistoryDBTask> task,
+      base::CancelableTaskTracker* tracker);
 
   // This callback is invoked when favicon change for urls.
   typedef base::Callback<void(const std::set<GURL>&)> OnFaviconChangedCallback;
 
   // Add a callback to the list. The callback will remain registered until the
   // returned Subscription is destroyed. This must occurs before HistoryService
   // is destroyed.
   scoped_ptr<base::CallbackList<void(const std::set<GURL>&)>::Subscription>
       AddFaviconChangedCallback(const OnFaviconChangedCallback& callback)
       WARN_UNUSED_RESULT;
@@ skipping 59 matching lines @@
   // These are not currently used, hopefully we can do something in the future
   // to ensure that the most important things happen first.
   enum SchedulePriority {
     PRIORITY_UI,      // The highest priority (must respond to UI events).
     PRIORITY_NORMAL,  // Normal stuff like adding a page.
     PRIORITY_LOW,     // Low priority things like indexing or expiration.
   };
 
  private:
   class BackendDelegate;
-#if defined(OS_ANDROID)
-  friend class AndroidHistoryProviderService;
-#endif
   friend class base::RefCountedThreadSafe<HistoryService>;
   friend class BackendDelegate;
   friend class FaviconService;
   friend class history::HistoryBackend;
   friend class history::HistoryQueryTest;
   friend class HistoryOperation;
   friend class HistoryQuickProviderTest;
   friend class history::HistoryTest;
   friend class HistoryURLProvider;
   friend class HistoryURLProviderTest;
@@ skipping 293 matching lines @@
 
   history::DeleteDirectiveHandler delete_directive_handler_;
 
   // All vended weak pointers are invalidated in Cleanup().
   base::WeakPtrFactory<HistoryService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryService);
 };
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_SERVICE_H_