We're leaking a number of VoiceEngine references in MediaEngineWebRTC.cpp and MediaEngineWebRTCAudio.cpp. Some of these go back to the beginning, because of the need to manually call Release(). Note that even with these plugged, we're not reliably releasing the MediaEngineWebRTCAudioSource objects before shutdown of MediaEngine (perhaps they're still ref'd by JS indirectly).

Comment on attachment 8386619 [details] [diff] [review] fix leaks of VoiceEngines in getUserMedia (WIP) first check shows a GUM audio test (gum_test.html) for audio-only leaks ~450K vs ~1.5MB (linux64) with this patch

several runs with gUM audio show no leaks in webrtc now; most leaks are coming from spdy and xpcom startup stuff.

With the getUserMedia changes only: https://tbpl.mozilla.org/?tree=Try&rev=7c84f8caa660

Patch is from bug 980304 (r=khuey fold of patch on this bug and followup there) https://hg.mozilla.org/integration/mozilla-inbound/rev/e2ca2e77c0ef