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

ui/views/controls/progress_bar.h

Index: ui/views/controls/progress_bar.h
diff --git a/ui/views/controls/progress_bar.h b/ui/views/controls/progress_bar.h
index 10ce757df6bbcf4b0d25f274171f9054bef60135..9f4cc0fc4fff28b0bd642c049593ebde2583bdb5 100644
--- a/ui/views/controls/progress_bar.h
+++ b/ui/views/controls/progress_bar.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.
 
@@ -45,7 +45,7 @@ class VIEWS_EXPORT ProgressBar : public View {
   // Overridden from View:
   virtual gfx::Size GetPreferredSize() OVERRIDE;
   virtual std::string GetClassName() const OVERRIDE;
-  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnPaint(gfx::CanvasSkia* canvas) OVERRIDE;
 
   // Inclusive range used when displaying values.
   double min_display_value_;