content: Cleanup class/struct forward declarations

content/browser/renderer_host/render_widget_host_view_android.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_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 20 matching lines @@
 #include "gpu/command_buffer/common/mailbox.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/android/view_android.h"
 #include "ui/android/window_android_observer.h"
 #include "ui/events/gesture_detection/filtered_gesture_provider.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 #include "ui/gfx/selection_bound.h"
 #include "ui/touch_selection/touch_selection_controller.h"
 
+class GURL;
+
 namespace cc {
-class CopyOutputResult;
 class Layer;
-class SurfaceFactory;
-class SurfaceIdAllocator;
 }
 
 namespace ui {
 struct DidOverscrollParams;
 }
 
 namespace blink {
-class WebExternalTextureLayer;
-class WebTouchEvent;
 class WebMouseEvent;
 }
 
 namespace ui {
 class DelegatedFrameHostAndroid;
 }
 
 namespace content {
 class ContentViewCoreImpl;
-class ContentViewCoreObserver;
 class OverscrollControllerAndroid;
 class RenderWidgetHost;
 class RenderWidgetHostImpl;
 class SynchronousCompositorHost;
 struct NativeWebKeyboardEvent;
 struct TextInputState;
 
 // -----------------------------------------------------------------------------
 // See comments in render_widget_host_view.h about this class and its members.
 // -----------------------------------------------------------------------------
@@ skipping 299 matching lines @@
   gfx::Vector2dF last_scroll_offset_;
 
   base::WeakPtrFactory<RenderWidgetHostViewAndroid> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_