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

chrome/browser/ui/views/about_chrome_view.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_ABOUT_CHROME_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_ABOUT_CHROME_VIEW_H_
 #pragma once
 
 #include <string>
 
@@ skipping 32 matching lines @@
  public:
   explicit AboutChromeView(Profile* profile);
   virtual ~AboutChromeView();
 
   // Initialize the controls on the dialog.
   void Init();
 
   // Overridden from views::View:
   virtual gfx::Size GetPreferredSize() OVERRIDE;
   virtual void Layout() OVERRIDE;
-  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnPaint(gfx::CanvasSkia* canvas) OVERRIDE;
   virtual void ViewHierarchyChanged(bool is_add,
                                     views::View* parent,
                                     views::View* child) OVERRIDE;
 
   // Overridden from views::DialogDelegate:
   virtual string16 GetDialogButtonLabel(ui::DialogButton button) const OVERRIDE;
   virtual bool IsDialogButtonEnabled(ui::DialogButton button) const OVERRIDE;
   virtual bool IsDialogButtonVisible(ui::DialogButton button) const OVERRIDE;
   virtual int GetDefaultDialogButton() const OVERRIDE;
   virtual bool CanResize() const OVERRIDE;
@@ skipping 77 matching lines @@
   // The version Google Update reports is available to us.
   string16 new_version_available_;
 
   // Whether text direction is left-to-right or right-to-left.
   bool text_direction_is_rtl_;
 
   DISALLOW_COPY_AND_ASSIGN(AboutChromeView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_ABOUT_CHROME_VIEW_H_