Bug 1099287 - Remove the unused nsJSContext::ReportPendingException; r=bholley

--HG--
extra : rebase_source : 5bd2dd41b5687632af5380a241ab683e1de8bc41
Bug 1099278 - Update nsGlobalWindow's StoreInSlot users to use a better error contract; r=bz

--HG--
extra : rebase_source : 7dd2ec19526925edfee8d819d99b7f892a0adbbb