ui: Cleanup class/struct forward declarations

ui/app_list/views/speech_view.h

 // Copyright 2013 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 UI_APP_LIST_VIEWS_SPEECH_VIEW_H_
 #define UI_APP_LIST_VIEWS_SPEECH_VIEW_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "ui/app_list/app_list_export.h"
 #include "ui/app_list/speech_ui_model_observer.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/view.h"
 
 namespace views {
 class BoundsAnimator;
 class ImageButton;
 class ImageView;
 class Label;
 }
 
 namespace app_list {
 
 class AppListViewDelegate;
-class SpeechCardView;
 
 // SpeechView provides the card-like UI for the search-by-speech.
 class APP_LIST_EXPORT SpeechView : public views::View,
                                    public views::ButtonListener,
                                    public SpeechUIModelObserver {
  public:
   explicit SpeechView(AppListViewDelegate* delegate);
   ~SpeechView() override;
 
   // Reset to the original state.
@@ skipping 24 matching lines @@
   views::ImageButton* mic_button_;
   views::Label* speech_result_;
   std::unique_ptr<views::BoundsAnimator> indicator_animator_;
 
   DISALLOW_COPY_AND_ASSIGN(SpeechView);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_VIEWS_SPEECH_VIEW_H_