Update to Chromium revision 231322.

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk@1494 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
Use scoped_refptr<> instead of raw pointer

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk@1495 5089003a-bbd8-11dd-ad1f-f1f9622dbc98