Move uncoupled code out of skia/ext/platform_device.h

ui/gfx/canvas_paint_mac.mm

 // 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/gfx/canvas_paint_mac.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace gfx {
 
 CanvasSkiaPaint::CanvasSkiaPaint(NSRect dirtyRect)
@@ skipping 50 matching lines @@
   gfx::Size size(NSWidth(rectangle_), NSHeight(rectangle_));
   RecreateBackingCanvas(size, scale, opaque);
   skia::PlatformCanvas* canvas = platform_canvas();
   canvas->clear(SkColorSetARGB(0, 0, 0, 0));
 
     // Need to translate so that the dirty region appears at the origin of the
     // surface.
   canvas->translate(-SkDoubleToScalar(NSMinX(rectangle_)),
                     -SkDoubleToScalar(NSMinY(rectangle_)));
 
-  context_ = skia::GetBitmapContext(skia::GetTopDevice(*canvas));
+  context_ = skia::GetBitmapContext(*canvas);
 }
 
 }  // namespace skia