cc: Cleanup class/struct forward declarations

cc/quads/shared_quad_state.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 CC_QUADS_SHARED_QUAD_STATE_H_
 #define CC_QUADS_SHARED_QUAD_STATE_H_
 
 #include <memory>
 
 #include "cc/base/cc_export.h"
 #include "third_party/skia/include/core/SkXfermode.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/transform.h"
 
 namespace base {
 namespace trace_event {
 class TracedValue;
 }
-class Value;
 }
 
 namespace cc {
 
 // SharedQuadState holds a set of properties that are common across multiple
 // DrawQuads. It's purely an optimization - the properties behave in exactly the
 // same way as if they were replicated on each DrawQuad. A given SharedQuadState
 // can only be shared by DrawQuads that are adjacent in their RenderPass'
 // QuadList.
 class CC_EXPORT SharedQuadState {
@@ skipping 23 matching lines @@
   gfx::Rect clip_rect;
   bool is_clipped;
   float opacity;
   SkXfermode::Mode blend_mode;
   int sorting_context_id;
 };
 
 }  // namespace cc
 
 #endif  // CC_QUADS_SHARED_QUAD_STATE_H_