Bug 808146: Declare nsMainThreadPtrHolder as MOZ_FINAL, to fix -Wdelete-non-virtual-dtor build-warning-spam. r=bholley, a=blocking-basecamp+
Bug 828502 - let nsMainThreadPtrHandle::get() handle nullptrs; r=bholley, a=blocking-basecamp+
Bug 827503 - use nsMainThreadPtrHolders when passing XPCWrappedJSes around off main thread, r=bholley,jst a=blocking-basecamp+
Bug 829121 - Follow-up: remove excessive dump() to not confuse developers. r=fabrice,a=followup

--HG--
extra : rebase_source : 6d8fda093048623f62b6b2df9934f19e32a85090