Add shutdown notification and service refs to SyncServiceObserver.

components/history/core/browser/history_delete_directives_data_type_controller.cc

 // 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.
 
 #include "components/history/core/browser/history_delete_directives_data_type_controller.h"
 
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/sync/driver/sync_client.h"
 #include "components/sync/driver/sync_service.h"
 
@@ skipping 25 matching lines @@
   sync_client_->GetSyncService()->AddObserver(this);
   return true;
 }
 
 void HistoryDeleteDirectivesDataTypeController::StopModels() {
   DCHECK(CalledOnValidThread());
   if (sync_client_->GetSyncService()->HasObserver(this))
     sync_client_->GetSyncService()->RemoveObserver(this);
 }
 
-void HistoryDeleteDirectivesDataTypeController::OnStateChanged() {
+void HistoryDeleteDirectivesDataTypeController::OnStateChanged(
+    syncer::SyncService* sync) {
   DisableTypeIfNecessary();
 }
 
 bool HistoryDeleteDirectivesDataTypeController::DisableTypeIfNecessary() {
   DCHECK(CalledOnValidThread());
   if (!sync_client_->GetSyncService()->IsSyncActive())
     return false;
 
   if (ReadyForStart())
     return false;
 
   if (sync_client_->GetSyncService()->HasObserver(this))
     sync_client_->GetSyncService()->RemoveObserver(this);
   syncer::SyncError error(
       FROM_HERE,
       syncer::SyncError::DATATYPE_POLICY_ERROR,
       "Delete directives not supported with encryption.",
       type());
   CreateErrorHandler()->OnUnrecoverableError(error);
   return true;
 }
 
 }  // namespace browser_sync