Bug 1067858 - apply |AutoNoJSAPI| before calling mAudioChannelAgent->SetVisibilityState in order not to hit nsContentUtils::IsCallerChrome() in HTMLMediaElement::CanPlayChanged().
Bug 1059265 - reduce number of concurrent playback and active cubeb streams to avoid hitting bug 847903.
Bug 847903 - Drop OS X AudioUnit stream limit even further on 10.6 to fix crashtests/691096-1.html