content: Cleanup class/struct forward declarations

content/browser/android/content_view_core_impl.h

 // Copyright 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_BROWSER_ANDROID_CONTENT_VIEW_CORE_IMPL_H_
 #define CONTENT_BROWSER_ANDROID_CONTENT_VIEW_CORE_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 12 matching lines @@
 #include "content/public/browser/android/content_view_core.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/android/overscroll_refresh.h"
 #include "ui/android/view_android.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/rect_f.h"
 #include "ui/gfx/selection_bound.h"
 #include "url/gurl.h"
 
-namespace cc {
-struct ViewportSelectionBound;
-}
-
 namespace ui {
 class WindowAndroid;
 }
 
 namespace content {
 
 class GinJavaBridgeDispatcherHost;
 class RenderFrameHost;
 class RenderWidgetHostViewAndroid;
 struct MenuItem;
@@ skipping 416 matching lines @@
   scoped_refptr<GinJavaBridgeDispatcherHost> java_bridge_dispatcher_host_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentViewCoreImpl);
 };
 
 bool RegisterContentViewCore(JNIEnv* env);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_CONTENT_VIEW_CORE_IMPL_H_