Backed out changeset f7e1426249f2 (bug 949651) for mochitest-5 failures.
Backed out 5 changesets (bug 1079653) for mochitest-dt asserts on a CLOSED TREE.

Backed out changeset aaac8c671299 (bug 1079653)
Backed out changeset 59d1754eb01f (bug 1079653)
Backed out changeset dfb0890b02be (bug 1079653)
Backed out changeset 546f90c14465 (bug 1079653)
Backed out changeset a8e760faf784 (bug 1079653)