Update Valgrind suppressions for bug 793548 and bug 823782. DONTBUILD

--HG--
extra : rebase_source : 933131ab806fdbd77ecebebd84ff94e68909def1
Merge the last PGO-green inbound changeset to m-c.
Bug 822712 - SimplePush - Interface. r=dougt, sr=sicking
Bug 822712 - SimplePush - Implementation. r=dougt, jst, jlebar
Bug 822712 - SimplePush - UDP Wakeup feature. r=jst, jlebar
Bug 822712 - SimplePush - Add PushManager to the test_interfaces.html test. r=dougt
Merge m-c to inbound.
Backed out changeset 17b7d2222f14 (bug 855407) for likely causing leaks.
Bug 842887 - Update Mozilla's copy of libevent from 1.4.7 to 2.0.21. r=bsmedberg
Bug 853805 - Add .CW to PSL. r=gerv.
Bug 842013 - Send key events for character input; r=cpeterson
Bug 842013 - Suppress key up events during key down event; r=cpeterson
Bug 842013 - Don't add extra modifiers to key press events; r=cpeterson
Bug 842013 - Buffer IME key events and dispatch them at once; r=cpeterson