[GTK] Make distcheck fails
https://bugs.webkit.org/show_bug.cgi?id=108756

Patch by Joanmarie Diggs <jdiggs@igalia.com> on 2013-02-03
Reviewed by Kentaro Hara.

Source/WebCore:

* GNUmakefile.list.am: Remove header files which no longer exist;
correct one which got added incorrectly.

Source/WebKit2:

* GNUmakefile.list.am: Remove header files which no longer exist

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141720 268f45cc-cd09-0410-ab3c-d52691b4dbfc