Backed out 7 changesets (bug 1109437) for suspicious-looking crashes on a CLOSED TREE.

Backed out changeset dc45e97d102d (bug 1109437)
Backed out changeset e6350e4fb18b (bug 1109437)
Backed out changeset 4c38dda06880 (bug 1109437)
Backed out changeset 72f171ec04ba (bug 1109437)
Backed out changeset ec275f65c676 (bug 1109437)
Backed out changeset 65d172e7a1cf (bug 1109437)
Backed out changeset 0b8a156dcff0 (bug 1109437)