cc: Remove the base RasterSource

cc/playback/raster_source_helper.h

Index: cc/playback/raster_source_helper.h
diff --git a/cc/playback/raster_source_helper.h b/cc/playback/raster_source_helper.h
deleted file mode 100644
index 9918703cd1fc04ef0ccaf6ea55fedc46c024f6ed..0000000000000000000000000000000000000000
--- a/cc/playback/raster_source_helper.h
+++ /dev/null
@@ -1,30 +0,0 @@
-// 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_PLAYBACK_RASTER_SOURCE_HELPER_H_
-#define CC_PLAYBACK_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_bitmap_rect,
-                                         const gfx::Rect& canvas_playback_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_PLAYBACK_RASTER_SOURCE_HELPER_H_