Backed out 5 changesets (bug 989667, bug 989641, bug 989748, bug 989759) for B2G bustage on a CLOSED TREE.

Backed out changeset 3dcbb0f401d8 (bug 989759)
Backed out changeset ee9fbb00aa80 (bug 989759)
Backed out changeset 2900014098ce (bug 989748)
Backed out changeset 3bd8dc58dcf3 (bug 989667)
Backed out changeset 10b769a8f5f2 (bug 989641)