Backed out changeset f1989cb41965 (bug 1093686) for B2G Desktop Linux opt m1 test failures
Bug 1094544.  Use [Exposed=System] some more instead of hardcoding binding bits in xpc::InitGlobalObject.  r=bholley
Bug 1084439 followup.  Remove now-unsed enum.
Bug 1091109: Followup to avoid intermittent test failures on a CLOSED TREE. r=myk a=lmandel,RyanVM