[Sync] Stop accessing BrowserContextKeyedServiceFactory on non-UI thread.

components/autofill/core/browser/webdata/autofill_profile_data_type_controller.h

 // Copyright 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 COMPONENTS_AUTOFILL_CORE_BROWSER_WEBDATA_AUTOFILL_PROFILE_DATA_TYPE_CONTROLLER_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_WEBDATA_AUTOFILL_PROFILE_DATA_TYPE_CONTROLLER_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ skipping 25 matching lines @@
 
  protected:
   // AsyncDirectoryTypeController:
   bool StartModels() override;
   void StopModels() override;
 
  private:
   // Callback to notify that WebDatabase has loaded.
   void WebDatabaseLoaded();
 
-  // A pointer to the sync client.
-  syncer::SyncClient* const sync_client_;
-
   // A reference to the AutofillWebDataService for this controller.
   scoped_refptr<autofill::AutofillWebDataService> web_data_service_;
 
   // Whether the database loaded callback has been registered.
   bool callback_registered_;
 
   DISALLOW_COPY_AND_ASSIGN(AutofillProfileDataTypeController);
 };
 
 }  // namespace browser_sync
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_WEBDATA_AUTOFILL_PROFILE_DATA_TYPE_CONTROLLER_H_