Remove parts of //cc we aren't using

cc/layers/solid_color_scrollbar_layer.h

-// Copyright 2013 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_SOLID_COLOR_SCROLLBAR_LAYER_H_
-#define CC_LAYERS_SOLID_COLOR_SCROLLBAR_LAYER_H_
-
-#include "cc/base/cc_export.h"
-#include "cc/layers/layer.h"
-#include "cc/layers/scrollbar_layer_interface.h"
-
-namespace cc {
-
-class CC_EXPORT SolidColorScrollbarLayer : public ScrollbarLayerInterface,
-                                           public Layer {
- public:
-  scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
-
-  static scoped_refptr<SolidColorScrollbarLayer> Create(
-      ScrollbarOrientation orientation,
-      int thumb_thickness,
-      int track_start,
-      bool is_left_side_vertical_scrollbar,
-      int scroll_layer_id);
-
-  // Layer overrides.
-  bool OpacityCanAnimateOnImplThread() const override;
-  ScrollbarLayerInterface* ToScrollbarLayer() override;
-
-  void PushPropertiesTo(LayerImpl* layer) override;
-  void PushScrollClipPropertiesTo(LayerImpl* layer) override;
-
-  void SetNeedsDisplayRect(const gfx::Rect& rect) override;
-
-  // ScrollbarLayerInterface
-  int ScrollLayerId() const override;
-  void SetScrollLayer(int layer_id) override;
-  void SetClipLayer(int layer_id) override;
-
-  ScrollbarOrientation orientation() const override;
-
- protected:
-  SolidColorScrollbarLayer(ScrollbarOrientation orientation,
-                           int thumb_thickness,
-                           int track_start,
-                           bool is_left_side_vertical_scrollbar,
-                           int scroll_layer_id);
-  ~SolidColorScrollbarLayer() override;
-
- private:
-  int scroll_layer_id_;
-  int clip_layer_id_;
-  ScrollbarOrientation orientation_;
-  int thumb_thickness_;
-  int track_start_;
-  bool is_left_side_vertical_scrollbar_;
-
-  DISALLOW_COPY_AND_ASSIGN(SolidColorScrollbarLayer);
-};
-
-}  // namespace cc
-
-#endif  // CC_LAYERS_SOLID_COLOR_SCROLLBAR_LAYER_H_