GetApproximateDuration  248 media/filters/source_buffer_stream.cc   base::TimeDelta GetApproximateDuration() const;
GetApproximateDuration 2106 media/filters/source_buffer_stream.cc     duration = GetApproximateDuration();
GetApproximateDuration 2147 media/filters/source_buffer_stream.cc   return ComputeFudgeRoom(GetApproximateDuration());