Backed out changeset a4d7f8764567 (bug 833795) to fix bug 856083. a=backout
Bug 850127 - 1/3: Expose threadId in SmsMessage and SmsThreadListItem. IDL/IPDL changes. sr=mounir
Bug 850127 - 2/3: DOM & IPC.
Bug 850127 - 3/3: RIL & test cases.