ui/gfx: Make gfx::Canvas inherit from gfx::CanvasSkia.

chrome/browser/ui/views/download/download_item_view.h

Index: chrome/browser/ui/views/download/download_item_view.h
diff --git a/chrome/browser/ui/views/download/download_item_view.h b/chrome/browser/ui/views/download/download_item_view.h
index 4fe630fc1c876d11cfe075e8923be43e21fbeea6..6f64cc0ae9fa5b99cb03c2ebcd17b1d3d97fd4a8 100644
--- a/chrome/browser/ui/views/download/download_item_view.h
+++ b/chrome/browser/ui/views/download/download_item_view.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 //
@@ -103,7 +103,7 @@ class DownloadItemView : public views::ButtonListener,
 
  protected:
   // Overridden from views::View:
-  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnPaint(gfx::CanvasSkia* canvas) OVERRIDE;
 
  private:
   enum State {
@@ -145,7 +145,7 @@ class DownloadItemView : public views::ButtonListener,
 
   // Convenience method to paint the 3 vertical bitmaps (bottom, middle, top)
   // that form the background.
-  void PaintBitmaps(gfx::Canvas* canvas,
+  void PaintBitmaps(gfx::CanvasSkia* canvas,
                     const SkBitmap* top_bitmap,
                     const SkBitmap* center_bitmap,
                     const SkBitmap* bottom_bitmap,