Backout a38692ea87ae (bug 827303) for xpcshell failures on a CLOSED TREE
Bug 828502 - let nsMainThreadPtrHandle::get() handle nullptrs; r=bholley
fix bustage from Bug 828169 on a CLOSED TREE
Backout c3268996719e (bug 828607) for bustage on a CLOSED TREE
Bug 827960 - Allow jit_test.py to run tests in parallel. r=terrence
Bug 828690 - Return Unrooted from StringBuffer::finish; r=billm

--HG--
extra : rebase_source : 732d8981d2bd19ea50d3db4477cff615068070dc