Remove parts of //cc we aren't using

cc/layers/scrollbar_theme_painter.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_SCROLLBAR_THEME_PAINTER_H_
-#define CC_LAYERS_SCROLLBAR_THEME_PAINTER_H_
-
-#include "cc/base/cc_export.h"
-
-class SkCanvas;
-
-namespace gfx {
-class Rect;
-}
-
-namespace cc {
-
-class CC_EXPORT ScrollbarThemePainter {
- public:
-  virtual ~ScrollbarThemePainter() {}
-
-  virtual void PaintScrollbarBackground(SkCanvas* canvas,
-                                        const gfx::Rect& rect) = 0;
-  virtual void PaintTrackBackground(SkCanvas* canvas,
-                                    const gfx::Rect& rect) = 0;
-  virtual void PaintBackTrackPart(SkCanvas* canvas,
-                                  const gfx::Rect& rect) = 0;
-  virtual void PaintForwardTrackPart(SkCanvas* canvas,
-                                     const gfx::Rect& rect) = 0;
-  virtual void PaintBackButtonStart(SkCanvas* canvas,
-                                    const gfx::Rect& rect) = 0;
-  virtual void PaintBackButtonEnd(SkCanvas* canvas,
-                                  const gfx::Rect& rect) = 0;
-  virtual void PaintForwardButtonStart(SkCanvas* canvas,
-                                       const gfx::Rect& rect) = 0;
-  virtual void PaintForwardButtonEnd(SkCanvas* canvas,
-                                     const gfx::Rect& rect) = 0;
-  virtual void PaintTickmarks(SkCanvas* canvas, const gfx::Rect& rect) = 0;
-  virtual void PaintThumb(SkCanvas* canvas, const gfx::Rect& rect) = 0;
-};
-
-}  // namespace cc
-
-#endif  // CC_LAYERS_SCROLLBAR_THEME_PAINTER_H_