chromecast: Cleanup class/struct fwd declarations

chromecast/browser/cast_content_window.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 CHROMECAST_BROWSER_CAST_CONTENT_WINDOW_H_
 #define CHROMECAST_BROWSER_CAST_CONTENT_WINDOW_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "chromecast/graphics/cast_vsync_settings.h"
 #include "content/public/browser/web_contents_observer.h"
 
 namespace aura {
 class WindowTreeHost;
 }
 
 namespace content {
 class BrowserContext;
 class WebContents;
 }
 
-namespace gfx {
-class Size;
-}
-
 namespace chromecast {
 namespace shell {
 
 class CastContentWindow : public content::WebContentsObserver,
                           public CastVSyncSettings::Observer {
  public:
   CastContentWindow();
 
   // Removes the window from the screen.
   ~CastContentWindow() override;
@@ skipping 25 matching lines @@
 #endif
   bool transparent_;
 
   DISALLOW_COPY_AND_ASSIGN(CastContentWindow);
 };
 
 }  // namespace shell
 }  // namespace chromecast
 
 #endif  // CHROMECAST_BROWSER_CAST_CONTENT_WINDOW_H_