Port HistoryService::ScheduleDBTask to CancelableTaskTracker

chrome/browser/history/delete_directive_handler.cc

Index: chrome/browser/history/delete_directive_handler.cc
diff --git a/chrome/browser/history/delete_directive_handler.cc b/chrome/browser/history/delete_directive_handler.cc
index 9c7d24e69e73dac7fd0b712ed7e7874a9462648a..dab5f97876c7a527de0a8a42cdc7462383103058 100644
--- a/chrome/browser/history/delete_directive_handler.cc
+++ b/chrome/browser/history/delete_directive_handler.cc
@@ -302,7 +302,7 @@ void DeleteDirectiveHandler::Start(
         new DeleteDirectiveTask(weak_ptr_factory_.GetWeakPtr(),
                                 initial_sync_data,
                                 DROP_AFTER_PROCESSING),
-        &internal_consumer_);
+        &internal_tracker_);
   }
 }
 
@@ -410,8 +410,9 @@ syncer::SyncError DeleteDirectiveHandler::ProcessSyncChanges(
     // in one chrome session.
     history_service->ScheduleDBTask(
         new DeleteDirectiveTask(weak_ptr_factory_.GetWeakPtr(),
-                                delete_directives, KEEP_AFTER_PROCESSING),
-        &internal_consumer_);
+                                delete_directives,
+                                KEEP_AFTER_PROCESSING),
+        &internal_tracker_);
   }
   return syncer::SyncError();
 }