Unreviewed. Fix make distcheck.

Source/WebCore:

* GNUmakefile.list.am: Remove unexistent header file.

Source/WTF:

* GNUmakefile.list.am: Add missing header file.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@153922 268f45cc-cd09-0410-ab3c-d52691b4dbfc