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

chrome/browser/speech/speech_input_bubble.h

Index: chrome/browser/speech/speech_input_bubble.h
diff --git a/chrome/browser/speech/speech_input_bubble.h b/chrome/browser/speech/speech_input_bubble.h
index d2c598e3d8257c4d901911a42a24c4f5c4d2e679..728bd51fe491decb873dc99d042e85c7c0728c79 100644
--- a/chrome/browser/speech/speech_input_bubble.h
+++ b/chrome/browser/speech/speech_input_bubble.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.
 
@@ -20,7 +20,6 @@ class WebContents;
 }
 
 namespace gfx {
-class Canvas;
 class Rect;
 }