cc: Remove deprecated DisplayItemList::Raster overload.

cc/raster/raster_source.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_RASTER_RASTER_SOURCE_H_
 #define CC_RASTER_RASTER_SOURCE_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 150 matching lines @@
   const gfx::Size size_;
   const bool clear_canvas_with_debug_color_;
   const int slow_down_raster_scale_factor_for_debug_;
 
   // In practice, this is only set once before raster begins, so it's ok with
   // respect to threading.
   ImageDecodeCache* image_decode_cache_;
 
  private:
   void RasterCommon(SkCanvas* canvas,
-                    SkPicture::AbortCallback* callback) const;
+                    SkPicture::AbortCallback* callback = nullptr) const;
 
   void PrepareForPlaybackToCanvas(SkCanvas* canvas) const;
 
   DISALLOW_COPY_AND_ASSIGN(RasterSource);
 };
 
 }  // namespace cc
 
 #endif  // CC_RASTER_RASTER_SOURCE_H_