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

skia/ext/bitmap_platform_device_linux.h

Index: skia/ext/bitmap_platform_device_linux.h
===================================================================
--- skia/ext/bitmap_platform_device_linux.h	(revision 6968)
+++ skia/ext/bitmap_platform_device_linux.h	(working copy)
@@ -40,7 +40,7 @@
 // something that we can't easily change.
 // -----------------------------------------------------------------------------
 
-namespace gfx {
+namespace skia {
 
 // -----------------------------------------------------------------------------
 // This is the Linux bitmap backing for Skia. We create a Cairo image surface
@@ -86,6 +86,6 @@
   scoped_refptr<BitmapPlatformDeviceLinuxData> data_;
 };
 
-}  // namespace gfx
+}  // namespace skia
 
 #endif  // SKIA_EXT_BITMAP_PLATFORM_DEVICE_LINUX_H_