Backed out 6 changesets (bug 743402) for reftest failures on a CLOSED TREE.

Backed out changeset 19848fff857e (bug 743402)
Backed out changeset 049168537ae0 (bug 743402)
Backed out changeset 3098fea37f2d (bug 743402)
Backed out changeset ada93e976dca (bug 743402)
Backed out changeset c7907c54187f (bug 743402)
Backed out changeset 2edbbf6440c4 (bug 743402)