components: Cleanup class/struct fwd declarations

components/translate/core/browser/translate_ui_delegate.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_UI_DELEGATE_H_
 #define COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_UI_DELEGATE_H_
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
 #include "components/translate/core/common/translate_errors.h"
 
 namespace translate {
 
 class LanguageState;
-class TranslateClient;
 class TranslateDriver;
 class TranslateManager;
 class TranslatePrefs;
 
 // The TranslateUIDelegate is a generic delegate for UI which offers Translate
 // feature to the user.
 
 // Note that the API offers a way to read/set language values through array
 // indices. Such indices are only valid as long as the visual representation
 // (infobar, bubble...) is in sync with the underlying language list which
@@ skipping 118 matching lines @@
 
   // The translation related preferences.
   std::unique_ptr<TranslatePrefs> prefs_;
 
   DISALLOW_COPY_AND_ASSIGN(TranslateUIDelegate);
 };
 
 }  // namespace translate
 
 #endif  // COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_UI_DELEGATE_H_