Remove parts of //cc we aren't using

cc/layers/image_layer.h

-// Copyright 2010 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_IMAGE_LAYER_H_
-#define CC_LAYERS_IMAGE_LAYER_H_
-
-#include "cc/base/cc_export.h"
-#include "cc/layers/content_layer.h"
-#include "third_party/skia/include/core/SkBitmap.h"
-
-namespace cc {
-
-class ImageLayerUpdater;
-
-// A Layer that contains only an Image element.
-class CC_EXPORT ImageLayer : public TiledLayer {
- public:
-  static scoped_refptr<ImageLayer> Create();
-
-  // Layer implementation.
-  void SetTexturePriorities(const PriorityCalculator& priority_calc) override;
-  bool Update(ResourceUpdateQueue* queue,
-              const OcclusionTracker<Layer>* occlusion) override;
-  void CalculateContentsScale(float ideal_contents_scale,
-                              float* contents_scale_x,
-                              float* contents_scale_y,
-                              gfx::Size* content_bounds) override;
-  void OnOutputSurfaceCreated() override;
-
-  void SetBitmap(const SkBitmap& image);
-
- protected:
-  bool HasDrawableContent() const override;
-
- private:
-  ImageLayer();
-  ~ImageLayer() override;
-
-  // TiledLayer Implementation.
-  LayerUpdater* Updater() const override;
-  void CreateUpdaterIfNeeded() override;
-
-  float ImageContentsScaleX() const;
-  float ImageContentsScaleY() const;
-
-  SkBitmap bitmap_;
-
-  scoped_refptr<ImageLayerUpdater> updater_;
-
-  DISALLOW_COPY_AND_ASSIGN(ImageLayer);
-};
-
-}  // namespace cc
-
-#endif  // CC_LAYERS_IMAGE_LAYER_H_