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

skia/ext/platform_canvas_linux.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_LINUX_H_
 #define SKIA_EXT_PLATFORM_CANVAS_LINUX_H_
 
 #include "skia/ext/platform_device_linux.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.
 class PlatformCanvasLinux : public SkCanvas {
  public:
   // Set is_opaque if you are going to erase the bitmap and not use
   // tranparency: this will enable some optimizations.  The shared_section
   // parameter is passed to gfx::PlatformDevice::create.  See it for details.
   //
@@ skipping 19 matching lines @@
 
   // Creates a device store for use by the canvas. By default, it creates a
   // BitmapPlatformDevice object. Can be overridden to change the object type.
   virtual SkDevice* createPlatformDevice(int width, int height, bool is_opaque);
 
   // Disallow copy and assign.
   PlatformCanvasLinux(const PlatformCanvasLinux&);
   PlatformCanvasLinux& operator=(const PlatformCanvasLinux&);
 };
 
-}  // namespace gfx
+}  // namespace skia
 
 #endif  // SKIA_EXT_PLATFORM_CANVAS_LINUX_H_