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

skia/ext/platform_device_mac.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_DEVICE_MAC_H_
 #define SKIA_EXT_PLATFORM_DEVICE_MAC_H_
 
 #import <ApplicationServices/ApplicationServices.h>
 #include "SkDevice.h"
 
 class SkMatrix;
 class SkPath;
 class SkRegion;
 
-namespace gfx {
+namespace skia {
 
 // A device is basically a wrapper around SkBitmap that provides a surface for
 // SkCanvas to draw into. Our device provides a surface CoreGraphics can also
 // write to. It also provides functionality to play well with CG drawing
 // functions.
 // This class is abstract and must be subclassed. It provides the basic
 // interface to implement it either with or without a bitmap backend.
 class PlatformDeviceMac : public SkDevice {
  public:
   // The CGContext that corresponds to the bitmap, used for CoreGraphics
@@ skipping 47 matching lines @@
 
   // Loops through each of the pixels in the specified range, invoking
   // adjustor for the alpha value of each pixel.
   virtual void processPixels(int x,
                              int y,
                              int width,
                              int height,
                              adjustAlpha adjustor) = 0;
 };
 
-}  // namespace gfx
+}  // namespace skia
 
 #endif  // SKIA_EXT_PLATFORM_DEVICE_MAC_H_