components: Cleanup class/struct fwd declarations

components/search_engines/search_engine_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_SEARCH_ENGINES_SEARCH_ENGINE_DATA_TYPE_CONTROLLER_H__
 #define COMPONENTS_SEARCH_ENGINES_SEARCH_ENGINE_DATA_TYPE_CONTROLLER_H__
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "components/search_engines/template_url_service.h"
 #include "components/sync/driver/ui_data_type_controller.h"
 
-class Profile;
-
 namespace browser_sync {
 
 // Controller for the SEARCH_ENGINES sync data type. This class tells sync
 // how to load the model for this data type, and the superclasses manage
 // controlling the rest of the state of the datatype with regards to sync.
 class SearchEngineDataTypeController : public syncer::UIDataTypeController {
  public:
   // |dump_stack| is called when an unrecoverable error occurs.
   SearchEngineDataTypeController(const base::Closure& dump_stack,
                                  syncer::SyncClient* sync_client,
@@ skipping 14 matching lines @@
 
   // A subscription to the OnLoadedCallback so it can be cleared if necessary.
   std::unique_ptr<TemplateURLService::Subscription> template_url_subscription_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchEngineDataTypeController);
 };
 
 }  // namespace browser_sync
 
 #endif  // COMPONENTS_SEARCH_ENGINES_SEARCH_ENGINE_DATA_TYPE_CONTROLLER_H__