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

ui/views/controls/scrollbar/native_scroll_bar_views.h

Index: ui/views/controls/scrollbar/native_scroll_bar_views.h
diff --git a/ui/views/controls/scrollbar/native_scroll_bar_views.h b/ui/views/controls/scrollbar/native_scroll_bar_views.h
index 136338c92bd9657f30719b7d78af0551a2ff655b..3cbca1e79c22a023c771bbd7620fa7c755579750 100644
--- a/ui/views/controls/scrollbar/native_scroll_bar_views.h
+++ b/ui/views/controls/scrollbar/native_scroll_bar_views.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.
 
@@ -15,7 +15,7 @@
 #include "ui/views/view.h"
 
 namespace gfx {
-class Canvas;
+class CanvasSkia;
 }
 
 namespace views {
@@ -36,7 +36,7 @@ class VIEWS_EXPORT NativeScrollBarViews : public BaseScrollBar,
  private:
   // View overrides:
   virtual void Layout() OVERRIDE;
-  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnPaint(gfx::CanvasSkia* canvas) OVERRIDE;
   virtual gfx::Size GetPreferredSize() OVERRIDE;
   virtual std::string GetClassName() const OVERRIDE;