Backed out 5 changesets (bug 1015871, bug 1020257, bug 1015887, bug 1005888, bug 1015894) for desktop B2G mochitest failures on a CLOSED TREE.

Backed out changeset dbcb9974b640 (bug 1020257)
Backed out changeset 3220b7b2efc9 (bug 1015894)
Backed out changeset 4e23647ae247 (bug 1015887)
Backed out changeset 59df0cdacc15 (bug 1015871)
Backed out changeset e7124b07804b (bug 1005888)