chrome: Cleanup class/struct forward declarations

chrome/browser/ui/views/ime/ime_window_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_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_IME_IME_WINDOW_VIEW_H_
 
 #include <memory>
 #include <string>
 
 #include "base/strings/string16.h"
 #include "chrome/browser/ui/ime/ime_native_window.h"
 #include "chrome/browser/ui/ime/ime_window.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "extensions/browser/extension_icon_image.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/image/image.h"
 #include "ui/views/widget/widget_delegate.h"
 #include "ui/views/widget/widget_observer.h"
 
-class Profile;
-
-namespace extensions {
-class Extension;
-}
-
 namespace views {
 class WebView;
 }
 
 namespace ui {
 
 class ImeWindowFrameView;
-class ImeWindowHost;
 
 // The views implementation for the IME window UI.
 // This interacts with ImeWindow through the ImeNativeWindow interface.
 class ImeWindowView : public ImeNativeWindow,
                       public views::WidgetDelegateView {
  public:
   enum class PointerType { MOUSE, TOUCH };
 
   ImeWindowView(ImeWindow* ime_window,
                 const gfx::Rect& bounds,
@@ skipping 52 matching lines @@
 
   // The web view control which hosts the web contents.
   views::WebView* web_view_;
 
   DISALLOW_COPY_AND_ASSIGN(ImeWindowView);
 };
 
 }  // namespace ui
 
 #endif  // CHROME_BROWSER_UI_VIEWS_IME_IME_WINDOW_VIEW_H_