Remove parts of //cc we aren't using

cc/layers/content_layer_client.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_LAYERS_CONTENT_LAYER_CLIENT_H_
-#define CC_LAYERS_CONTENT_LAYER_CLIENT_H_
-
-#include "cc/base/cc_export.h"
-#include "cc/resources/display_item_list.h"
-
-class SkCanvas;
-
-namespace gfx {
-class Rect;
-class RectF;
-}
-
-namespace cc {
-
-class CC_EXPORT ContentLayerClient {
- public:
-  enum PaintingControlSetting {
-    PAINTING_BEHAVIOR_NORMAL,
-    DISPLAY_LIST_CONSTRUCTION_DISABLED,
-    DISPLAY_LIST_CACHING_DISABLED
-  };
-
-  virtual void PaintContents(SkCanvas* canvas,
-                             const gfx::Rect& clip,
-                             PaintingControlSetting painting_status) = 0;
-
-  virtual scoped_refptr<DisplayItemList> PaintContentsToDisplayList(
-      const gfx::Rect& clip,
-      PaintingControlSetting painting_status) = 0;
-
-  // If true the layer may skip clearing the background before rasterizing,
-  // because it will cover any uncleared data with content.
-  virtual bool FillsBoundsCompletely() const = 0;
-
- protected:
-  virtual ~ContentLayerClient() {}
-};
-
-}  // namespace cc
-
-#endif  // CC_LAYERS_CONTENT_LAYER_CLIENT_H_