Unreviewed, rolling out r170889.
https://bugs.webkit.org/show_bug.cgi?id=134754

This patch is wrong (Requested by philn on #webkit).

Reverted changeset:

"[GTK] Gstreamer missing from the install-dependencies script"
https://bugs.webkit.org/show_bug.cgi?id=134727
http://trac.webkit.org/changeset/170889

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@170915 268f45cc-cd09-0410-ab3c-d52691b4dbfc