Bug 770840 - Remove XPConnect test that explicitly runs JS on a seperate thread. v1
Bug 770840 - Add Runtime aborts when using XPCWrappedJS off-main-thread. v2
Backed out changeset 94fb66d82988 (bug 877584)
Backed out changeset 2864e2610800 (bug 877584) for causing bug 881266
Merge mozilla-central and inbound