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

chrome/browser/ui/views/theme_background.h

Index: chrome/browser/ui/views/theme_background.h
diff --git a/chrome/browser/ui/views/theme_background.h b/chrome/browser/ui/views/theme_background.h
index 9461f285dfce4838f6901fb92eb0dbb6735653de..e0f8e097d7aee408f0fc002b10a64d3314870762 100644
--- a/chrome/browser/ui/views/theme_background.h
+++ b/chrome/browser/ui/views/theme_background.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.
 
@@ -31,7 +31,7 @@ class ThemeBackground : public views::Background {
   virtual ~ThemeBackground() {}
 
   // Overridden from views:;Background.
-  virtual void Paint(gfx::Canvas* canvas, views::View* view) const OVERRIDE;
+  virtual void Paint(gfx::CanvasSkia* canvas, views::View* view) const OVERRIDE;
 
  private:
   BrowserView* browser_view_;