Bug 881370 - Remove entry from Debugger HashMap before instead of after mutating the HashMap. r=jimb

--HG--
extra : rebase_source : e630194150bb9c81279ac006a70128234732e306
Bug 880739 - Fix for intermittent browser_context_menu_tests.js. r=bbondy
Bug 817820 - Change cursor to reflect that middle-click scrolling (autoscroll) is active. r=mbrubeck
Bug 881950 - Update test harness to return a retry return code when activation fails. r=bbondy
Bug 881681: Don't try to reset context attributes when they are already frozen r=bz
Bug 871444 - Round allocation size to keep required alignment. r=sstangl