Remove parts of //cc we aren't using

cc/layers/scrollbar_layer_impl_base.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_SCROLLBAR_LAYER_IMPL_BASE_H_
-#define CC_LAYERS_SCROLLBAR_LAYER_IMPL_BASE_H_
-
-#include "cc/base/cc_export.h"
-#include "cc/input/scrollbar.h"
-#include "cc/layers/layer.h"
-#include "cc/layers/layer_impl.h"
-
-namespace cc {
-
-class LayerTreeImpl;
-
-class CC_EXPORT ScrollbarLayerImplBase : public LayerImpl {
- public:
-  int ScrollLayerId() const {
-    return scroll_layer_ ? scroll_layer_->id() : Layer::INVALID_ID;
-  }
-  int ClipLayerId() const {
-    return clip_layer_ ? clip_layer_->id() : Layer::INVALID_ID;
-  }
-
-  void SetScrollLayerAndClipLayerByIds(int scroll_layer_id, int clip_layer_id);
-  void ClearScrollLayer() { scroll_layer_ = nullptr; }
-  void ClearClipLayer() { clip_layer_ = nullptr; }
-
-  float current_pos() const { return current_pos_; }
-  bool SetCurrentPos(float current_pos);
-  int maximum() const { return maximum_; }
-  bool SetMaximum(int maximum);
-
-  bool SetVerticalAdjust(float vertical_adjust);
-
-  bool is_overlay_scrollbar() const { return is_overlay_scrollbar_; }
-  void set_is_overlay_scrollbar(bool is_overlay) {
-    is_overlay_scrollbar_ = is_overlay;
-  }
-
-  ScrollbarOrientation orientation() const { return orientation_; }
-  bool is_left_side_vertical_scrollbar() {
-    return is_left_side_vertical_scrollbar_;
-  }
-
-  bool CanScrollOrientation() const;
-
-  void PushPropertiesTo(LayerImpl* layer) override;
-  ScrollbarLayerImplBase* ToScrollbarLayer() override;
-  void PushScrollClipPropertiesTo(LayerImpl* layer);
-
-  bool SetVisibleToTotalLengthRatio(float ratio);
-  // Thumb quad rect in layer space.
-  virtual gfx::Rect ComputeThumbQuadRect() const;
-
-  float thumb_thickness_scale_factor() {
-    return thumb_thickness_scale_factor_;
-  }
-  bool SetThumbThicknessScaleFactor(float thumb_thickness_scale_factor);
-
-  void ScrollbarParametersDidChange(bool on_resize);
-
- protected:
-  ScrollbarLayerImplBase(LayerTreeImpl* tree_impl,
-                         int id,
-                         ScrollbarOrientation orientation,
-                         bool is_left_side_vertical_scrollbar,
-                         bool is_overlay);
-  ~ScrollbarLayerImplBase() override;
-
-  gfx::Rect ScrollbarLayerRectToContentRect(const gfx::RectF& layer_rect) const;
-
-  float visible_to_total_length_ratio() const {
-    return visible_to_total_length_ratio_;
-  }
-  float vertical_adjust() const { return vertical_adjust_; }
-
-  virtual int ThumbThickness() const = 0;
-  virtual int ThumbLength() const = 0;
-  virtual float TrackLength() const = 0;
-  virtual int TrackStart() const = 0;
-  // Indicates whether the thumb length can be changed without going back to the
-  // main thread.
-  virtual bool IsThumbResizable() const = 0;
-
- private:
-  LayerImpl* scroll_layer_;
-  LayerImpl* clip_layer_;
-  bool is_overlay_scrollbar_;
-
-  float thumb_thickness_scale_factor_;
-  float current_pos_;
-  int maximum_;
-  ScrollbarOrientation orientation_;
-  bool is_left_side_vertical_scrollbar_;
-
-  // Difference between the clip layer's height and the visible viewport
-  // height (which may differ in the presence of top-controls hiding).
-  float vertical_adjust_;
-
-  float visible_to_total_length_ratio_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScrollbarLayerImplBase);
-};
-
-}  // namespace cc
-
-#endif  // CC_LAYERS_SCROLLBAR_LAYER_IMPL_BASE_H_