Bug 496923 - Update the test262-updating script to import the ch09 tests.  r=terrence

--HG--
extra : rebase_source : ec86e42b9808880804d06599fdf334602e1b2842
Bug 496923 - Import the ch09 test262 tests into jstests.  r=generating-script-was-reviewed

--HG--
extra : rebase_source : 2734046863d49aa9400d1602a65dc8a851b10b05
Bug 555120 - Fix intermittent failure in browser_bug441778.js, and in ContentPrefService2, invalidate cache entries when async mutators start. r=mak