chrome: Cleanup class/struct forward declarations

chrome/browser/ui/views/ime/ime_window_frame_view.h

 // Copyright 2016 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 CHROME_BROWSER_UI_VIEWS_IME_IME_WINDOW_FRAME_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_IME_IME_WINDOW_FRAME_VIEW_H_
 
 #include "chrome/browser/ui/ime/ime_window.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/window/non_client_view.h"
 
 namespace views {
 class ImageButton;
 class ImageView;
-class Label;
 }
 
 namespace ui {
 
 class ImeWindowView;
 
 // The non-client frame view implementation for the IME window UI.
 class ImeWindowFrameView : public views::NonClientFrameView,
                            public views::ButtonListener {
  public:
@@ skipping 49 matching lines @@
   ImeWindow::Mode mode_;
   views::ImageButton* close_button_;
   views::ImageView* title_icon_;
 
   DISALLOW_COPY_AND_ASSIGN(ImeWindowFrameView);
 };
 
 }  // namespace ui
 
 #endif  // CHROME_BROWSER_UI_VIEWS_IME_IME_WINDOW_FRAME_VIEW_H_