Cleanup gfx::Canvas now that 10562027 has landed

ui/gfx/image/canvas_image_source.cc

 // Copyright (c) 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.
 
 #include "ui/gfx/image/canvas_image_source.h"
 
 #include "base/logging.h"
 #include "ui/gfx/canvas.h"
 #include "ui/base/layout.h"
 
 namespace gfx {
 
 ////////////////////////////////////////////////////////////////////////////////
 // CanvasImageSource
 
 CanvasImageSource::CanvasImageSource(const gfx::Size& size, bool is_opaque)
     : size_(size),
       is_opaque_(is_opaque) {
 }
 
 gfx::ImageSkiaRep CanvasImageSource::GetImageForScale(
     ui::ScaleFactor scale_factor) {
   gfx::Canvas canvas(size_, scale_factor, is_opaque_);
   Draw(&canvas);
-  return canvas.ExtractImageSkiaRep();
+  return canvas.ExtractImageRep();
 }
 
 }  // namespace gfx