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

skia/ext/bitmap_platform_device_win.cc

Index: skia/ext/bitmap_platform_device_win.cc
===================================================================
--- skia/ext/bitmap_platform_device_win.cc	(revision 6968)
+++ skia/ext/bitmap_platform_device_win.cc	(working copy)
@@ -10,7 +10,7 @@
 #include "SkRegion.h"
 #include "SkUtils.h"
 
-namespace gfx {
+namespace skia {
 
 // When Windows draws text, is sets the fourth byte (which Skia uses for alpha)
 // to zero. This means that if we try compositing with text that Windows has
@@ -242,7 +242,7 @@
   }
 
   BITMAPINFOHEADER hdr = {0};
-  CreateBitmapHeader(width, height, &hdr);
+  gfx::CreateBitmapHeader(width, height, &hdr);
 
   void* data = NULL;
   HBITMAP hbitmap = CreateDIBSection(screen_dc,
@@ -442,5 +442,5 @@
   }
 }
 
-}  // namespace gfx
+}  // namespace skia