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2b33993b82
Find nsIDocument via mGlobal (as nsPIDOMWindow) rather than via pointer to HTMLTrackElement. (bz from #content has explained how we can access nsPIDOMWindow and nsIDocument without having to ask the HTMLTrackElement) For the time being, there are many null-ness checks for both 'window' and 'document', and no mechanism to report errors other than returning nullptr where possible. This will be addressed in a followup bug. Also adds a test for mHead nullness in TextTrackCue::ConvertNodeTreeToDOMTree to prevent SIGSEV.
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