Bug 847594 - Paris binding for DataContainerEvent, r=peterv

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extra : rebase_source : ff4ad6b1b5a582c6e1b973fd1729aa2c6f7db314
Add even more logging to try to diagnose the cause for test_dbgsocket.js failing intermittently (bug 775924); r=me
Bug 872122 - clean up nsDOMCameraManager::GetListOfCameras(), r=bz