Backed out 3 changesets (bug 877527, bug 878765) for mochitest-1 timeouts on a CLOSED TREE.

Backed out changeset 0bf1e71fe3cc (bug 877527)
Backed out changeset 8473deb5fba9 (bug 878765)
Backed out changeset 0d327854300c (bug 877527)
Backed out 7 changesets (bug 872147, bug 872143, bug 877467, bug 877200, bug 870063, bug 872149) for robocop-2 failures on a CLOSED TREE.

Backed out changeset 3a1e8e7ac07e (bug 870063)
Backed out changeset 8904d2bf5da0 (bug 877200)
Backed out changeset 80455a25276b (bug 872149)
Backed out changeset c3b5567f1271 (bug 872147)
Backed out changeset d3106edd4a5a (bug 872143)
Backed out changeset 4fd2ae88da98 (bug 870063)
Backed out changeset 1797dc46e862 (bug 877467)