cc: Cleanup class/struct forward declarations

cc/blink/web_display_item_list_impl.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 CC_BLINK_WEB_DISPLAY_ITEM_LIST_IMPL_H_
 #define CC_BLINK_WEB_DISPLAY_ITEM_LIST_IMPL_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "cc/blink/cc_blink_export.h"
 #include "cc/playback/display_item_list.h"
 #include "third_party/WebKit/public/platform/WebDisplayItemList.h"
 #include "third_party/WebKit/public/platform/WebVector.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "third_party/skia/include/core/SkXfermode.h"
 #include "ui/gfx/geometry/point_f.h"
 
 class SkColorFilter;
-class SkImageFilter;
 class SkMatrix44;
 class SkPath;
 class SkPicture;
 class SkRRect;
 
 namespace blink {
 struct WebFloatRect;
 struct WebFloatPoint;
 struct WebRect;
 }
 
 namespace cc {
-class DisplayItemListSettings;
 class FilterOperations;
 }
 
 namespace cc_blink {
 
 class WebDisplayItemListImpl : public blink::WebDisplayItemList {
  public:
   CC_BLINK_EXPORT WebDisplayItemListImpl();
   CC_BLINK_EXPORT explicit WebDisplayItemListImpl(
       cc::DisplayItemList* display_list);
@@ skipping 31 matching lines @@
 
  private:
   scoped_refptr<cc::DisplayItemList> display_item_list_;
 
   DISALLOW_COPY_AND_ASSIGN(WebDisplayItemListImpl);
 };
 
 }  // namespace cc_blink
 
 #endif  // CC_BLINK_WEB_DISPLAY_ITEM_LIST_IMPL_H_