Backed out 4 changesets (bug 893858, bug 868859, bug 886903) for Linux debug mochitest-other crashes on a CLOSED TREE.

Backed out changeset 0ded4854067b (bug 886903)
Backed out changeset ca8afb897e13 (bug 893858)
Backed out changeset c15f503a96cc (bug 868859)
Backed out changeset 6a788f399a7f (bug 868859)