It looks like one of included headers contains "using namespace WTF", otherwise it should not compile.
Created attachment 268967 [details] Patch
Comment on attachment 268967 [details] Patch Thanks.
Comment on attachment 268967 [details] Patch Clearing flags on attachment: 268967 Committed r195094: <http://trac.webkit.org/changeset/195094>
All reviewed patches have been landed. Closing bug.