Move the "platform" wrappers in skia/ext to the skia namespace.

skia/ext/platform_canvas_win.h

 // Copyright (c) 2006-2008 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.
 
 #ifndef SKIA_EXT_PLATFORM_CANVAS_WIN_H_
 #define SKIA_EXT_PLATFORM_CANVAS_WIN_H_
 
 #include <windows.h>
 
 #include "base/basictypes.h"
 #include "skia/ext/platform_device_win.h"
 
 #include "SkCanvas.h"
 
-namespace gfx {
+namespace skia {
 
 // This class is a specialization of the regular SkCanvas that is designed to
-// work with a gfx::PlatformDevice to manage platform-specific drawing. It
-// allows using both Skia operations and platform-specific operations.
+// work with a PlatformDevice to manage platform-specific drawing. It allows
+// using both Skia operations and platform-specific operations.
 class PlatformCanvasWin : public SkCanvas {
  public:
   // Set is_opaque if you are going to erase the bitmap and not use
   // transparency: this will enable some optimizations.  The shared_section
   // parameter is passed to gfx::PlatformDevice::create.  See it for details.
   //
   // If you use the version with no arguments, you MUST call initialize()
   PlatformCanvasWin();
   PlatformCanvasWin(int width, int height, bool is_opaque);
   PlatformCanvasWin(int width, int height, bool is_opaque,
@@ skipping 159 matching lines @@
   // If true, this canvas was created for a BeginPaint.
   const bool for_paint_;
 
   // Disallow copy and assign.
   CanvasPaintT(const CanvasPaintT&);
   CanvasPaintT& operator=(const CanvasPaintT&);
 };
 
 typedef CanvasPaintT<PlatformCanvasWin> PlatformCanvasWinPaint;
 
-}  // namespace gfx
+}  // namespace skia
 
 #endif  // SKIA_EXT_PLATFORM_CANVAS_WIN_H_