content: Cleanup class/struct forward declarations

content/public/browser/android/content_view_core.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_ANDROID_CONTENT_VIEW_CORE_H_
 #define CONTENT_PUBLIC_BROWSER_ANDROID_CONTENT_VIEW_CORE_H_
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
 #include "base/callback.h"
 #include "base/strings/string16.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/readback_types.h"
 #include "ui/android/view_android.h"
 #include "ui/gfx/geometry/rect.h"
 
-namespace cc {
-class Layer;
-}
-
-namespace gfx {
-class Rect;
-}
-
 namespace ui {
 class WindowAndroid;
 }
 
 namespace content {
 
 class WebContents;
 
 // DEPRECATED. Do not add methods.
 // Refer to the public WebContents interface or elsewhere instead.
@@ skipping 10 matching lines @@
 
   virtual ui::WindowAndroid* GetWindowAndroid() const = 0;
 
  protected:
  ~ContentViewCore() {}
 };
 
 };  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_ANDROID_CONTENT_VIEW_CORE_H_