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

skia/ext/platform_canvas_win.cc

Index: skia/ext/platform_canvas_win.cc
===================================================================
--- skia/ext/platform_canvas_win.cc	(revision 6968)
+++ skia/ext/platform_canvas_win.cc	(working copy)
@@ -8,7 +8,7 @@
 #include "base/process_util.h"
 #include "skia/ext/bitmap_platform_device_win.h"
 
-namespace gfx {
+namespace skia {
 
 // Crashes the process. This is called when a bitmap allocation fails, and this
 // function tries to determine why it might have failed, and crash on different
@@ -114,4 +114,4 @@
   return NULL;
 }
 
-}  // namespace gfx
+}  // namespace skia