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

ui/views/controls/button/text_button.cc

 // 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.
 
 #include "ui/views/controls/button/text_button.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "grit/ui_resources.h"
 #include "ui/base/animation/throb_animation.h"
 #include "ui/base/resource/resource_bundle.h"
-#include "ui/gfx/canvas_skia.h"
+#include "ui/gfx/canvas.h"
 #include "ui/gfx/image/image.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/events/event.h"
 #include "ui/views/widget/widget.h"
 
 #if defined(OS_WIN)
 #include "skia/ext/skia_utils_win.h"
 #include "ui/gfx/native_theme_win.h"
 #include "ui/gfx/platform_font_win.h"
 #endif
@@ skipping 811 matching lines @@
 #endif
 }
 
 void NativeTextButton::GetExtraParams(
     gfx::NativeTheme::ExtraParams* params) const {
   TextButton::GetExtraParams(params);
   params->button.has_border = true;
 }
 
 }  // namespace views