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

ui/views/controls/menu/menu_item_view_win.cc

Index: ui/views/controls/menu/menu_item_view_win.cc
diff --git a/ui/views/controls/menu/menu_item_view_win.cc b/ui/views/controls/menu/menu_item_view_win.cc
index 19fc97f1347f71983b91bd12870ece0bf21a5060..d358cd37a24ac504cd2df2612418e5d9b9f06ed9 100644
--- a/ui/views/controls/menu/menu_item_view_win.cc
+++ b/ui/views/controls/menu/menu_item_view_win.cc
@@ -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.
 
@@ -92,7 +92,7 @@ void MenuItemView::PaintButton(gfx::Canvas* canvas, PaintButtonMode mode) {
     // foreground and background colors are for the text to draw the correct
     // halo. Instead, just draw black on white, which will look good in most
     // cases.
-    canvas->AsCanvasSkia()->DrawStringWithHalo(
+    canvas->DrawStringWithHalo(
         title(), font, 0x00000000, 0xFFFFFFFF, text_bounds.x(),
         text_bounds.y(), text_bounds.width(), text_bounds.height(),
         GetRootMenuItem()->GetDrawStringFlags());