components: Cleanup class/struct fwd declarations

components/webdata_services/web_data_service_wrapper.h

 // 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.
 
 #ifndef COMPONENTS_WEBDATA_SERVICES_WEB_DATA_SERVICE_WRAPPER_H_
 #define COMPONENTS_WEBDATA_SERVICES_WEB_DATA_SERVICE_WRAPPER_H_
 
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "build/build_config.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/sync/model/syncable_service.h"
 #include "sql/init_status.h"
 
 class KeywordWebDataService;
 class TokenWebData;
 class WebDatabaseService;
 
 #if defined(OS_WIN)
 class PasswordWebDataService;
 #endif
 
 namespace autofill {
-class AutofillWebDataBackend;
 class AutofillWebDataService;
 }  // namespace autofill
 
 namespace base {
 class FilePath;
 class SingleThreadTaskRunner;
 }  // namespace base
 
 // WebDataServiceWrapper is a KeyedService that owns multiple WebDataServices
 // so that they can be associated with a context.
@@ skipping 55 matching lines @@
   scoped_refptr<TokenWebData> token_web_data_;
 
 #if defined(OS_WIN)
   scoped_refptr<PasswordWebDataService> password_web_data_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(WebDataServiceWrapper);
 };
 
 #endif  // COMPONENTS_WEBDATA_SERVICES_WEB_DATA_SERVICE_WRAPPER_H_