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

ui/gfx/canvas.cc

Index: ui/gfx/canvas.cc
diff --git a/ui/gfx/canvas.cc b/ui/gfx/canvas.cc
deleted file mode 100644
index 619f93f6f03fcef6fef6830bed41dba5b040a656..0000000000000000000000000000000000000000
--- a/ui/gfx/canvas.cc
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright (c) 2011 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.
-
-#include "ui/gfx/canvas.h"
-
-namespace gfx {
-
-CanvasSkia* Canvas::AsCanvasSkia() {
-  return NULL;
-}
-
-const CanvasSkia* Canvas::AsCanvasSkia() const {
-  return NULL;
-}
-
-SkCanvas* Canvas::GetSkCanvas() {
-  return NULL;
-}
-
-const SkCanvas* Canvas::GetSkCanvas() const {
-  return NULL;
-}
-
-}  // namespace gfx