Port HistoryService::ScheduleDBTask to CancelableTaskTracker

chrome/browser/history/delete_directive_handler.h

 // Copyright (c) 2013 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_DELETE_DIRECTIVE_HANDLER_H_
 #define CHROME_BROWSER_HISTORY_DELETE_DIRECTIVE_HANDLER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread_checker.h"
-#include "chrome/browser/common/cancelable_request.h"
+#include "base/task/cancelable_task_tracker.h"
 #include "sync/api/sync_change_processor.h"
 #include "sync/api/sync_data.h"
 
 namespace sync_pb {
 class HistoryDeleteDirectiveSpecifics;
 }
 
 class HistoryService;
 
 namespace history {
@@ skipping 42 matching lines @@
   enum PostProcessingAction {
     KEEP_AFTER_PROCESSING,
     DROP_AFTER_PROCESSING
   };
 
   // Callback when history backend finishes deleting visits according to
   // |delete_directives|.
   void FinishProcessing(PostProcessingAction post_processing_action,
                         const syncer::SyncDataList& delete_directives);
 
-  CancelableRequestConsumer internal_consumer_;
+  base::CancelableTaskTracker internal_tracker_;
   scoped_ptr<syncer::SyncChangeProcessor> sync_processor_;
   base::ThreadChecker thread_checker_;
   base::WeakPtrFactory<DeleteDirectiveHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DeleteDirectiveHandler);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_DELETE_DIRECTIVE_HANDLER_H_