Remove parts of //cc we aren't using

cc/resources/raster_source_helper.h

-// Copyright 2014 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_RESOURCES_RASTER_SOURCE_HELPER_H_
-#define CC_RESOURCES_RASTER_SOURCE_HELPER_H_
-
-#include "cc/base/cc_export.h"
-#include "third_party/skia/include/core/SkColor.h"
-#include "ui/gfx/geometry/rect.h"
-
-class SkCanvas;
-
-namespace cc {
-
-class CC_EXPORT RasterSourceHelper {
- public:
-  static void PrepareForPlaybackToCanvas(SkCanvas* canvas,
-                                         const gfx::Rect& canvas_rect,
-                                         const gfx::Rect& source_rect,
-                                         float contents_scale,
-                                         SkColor background_color,
-                                         bool clear_canvas_with_debug_color,
-                                         bool requires_clear);
-};
-
-}  // namespace cc
-
-#endif  // CC_RESOURCES_RASTER_SOURCE_HELPER_H_