Remove parts of //cc we aren't using

cc/input/scrollbar.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_INPUT_SCROLLBAR_H_
-#define CC_INPUT_SCROLLBAR_H_
-
-#include "cc/base/cc_export.h"
-#include "ui/gfx/geometry/point.h"
-#include "ui/gfx/geometry/rect.h"
-
-class SkCanvas;
-
-namespace cc {
-
-enum ScrollbarOrientation { HORIZONTAL, VERTICAL };
-enum ScrollDirection { SCROLL_BACKWARD, SCROLL_FORWARD };
-// For now, TRACK includes everything but the thumb including background and
-// buttons.
-enum ScrollbarPart { THUMB, TRACK };
-
-class Scrollbar {
- public:
-  virtual ~Scrollbar() {}
-
-  virtual ScrollbarOrientation Orientation() const = 0;
-  virtual bool IsLeftSideVerticalScrollbar() const = 0;
-  virtual gfx::Point Location() const = 0;
-  virtual bool IsOverlay() const = 0;
-  virtual bool HasThumb() const = 0;
-  virtual int ThumbThickness() const = 0;
-  virtual int ThumbLength() const = 0;
-  virtual gfx::Rect TrackRect() const = 0;
-  virtual void PaintPart(SkCanvas* canvas,
-                         ScrollbarPart part,
-                         const gfx::Rect& content_rect) = 0;
-};
-
-}  // namespace cc
-
-#endif  // CC_INPUT_SCROLLBAR_H_