Backed out 4 changesets (bug 1064333) for XPCShell bustage

Backed out changeset 378314f2892c (bug 1064333)
Backed out changeset ccb8a2ac9746 (bug 1064333)
Backed out changeset 3466ed3b9b61 (bug 1064333)
Backed out changeset 553c113c8f4e (bug 1064333)