Backed out changeset 2275f8be60c9 (bug 975255)
Backed out changeset 18d79e1e15f9 (bug 958317)
Backed out changeset 240333c3d2c1 (bug 964039)
Backed out changeset 234c0b4ec7c9 (bug 922081)
Backed out changeset a43ae8497706 (bug 968101)
Backed out changeset d8543551f12e (bug 913808)
Backed out changeset f514ab5c4b5b (bug 923016) for B2G xpcshell crashes; CLOSED TREE