Backed out 10 changesets (bug 1523638) for causing high frequency Android 7.0 mochitests failures CLOSED TREE

Backed out changeset 644ceb2fe568 (bug 1523638)
Backed out changeset 27647ee7a927 (bug 1523638)
Backed out changeset 96f1ccb95570 (bug 1523638)
Backed out changeset b60a17ea716a (bug 1523638)
Backed out changeset 507e63186c5f (bug 1523638)
Backed out changeset 33255408ca61 (bug 1523638)
Backed out changeset d97b2d223616 (bug 1523638)
Backed out changeset eba2a0514cde (bug 1523638)
Backed out changeset d7065174c5c4 (bug 1523638)
Backed out changeset c21b361e175d (bug 1523638)