components: Cleanup class/struct fwd declarations

components/translate/core/browser/translate_manager.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_TRANSLATE_CORE_BROWSER_TRANSLATE_MANAGER_H_
 #define COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_MANAGER_H_
 
 #include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/callback_list.h"
 #include "base/feature_list.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "components/translate/core/browser/language_state.h"
 #include "components/translate/core/common/translate_errors.h"
 
-class GURL;
-class PrefService;
-
 namespace metrics {
 class TranslateEventProto;
 }
 
 namespace translate {
 
 extern const base::Feature kTranslateLanguageByULP;
 
 class TranslateClient;
 class TranslateDriver;
@@ skipping 140 matching lines @@
   // By default, don't offer to translate in builds lacking an API key. For
   // testing, set to true to offer anyway.
   static bool ignore_missing_key_for_testing_;
 
   DISALLOW_COPY_AND_ASSIGN(TranslateManager);
 };
 
 }  // namespace translate
 
 #endif  // COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_MANAGER_H_