Add RTCMediaStreamTrackStats to nonstandard externs.
Add RTCMediaStreamTrackStats to nonstandard externs.

PiperOrigin-RevId: 376223763

ChadKillingsworth/closure-compiler,google/closure-compiler,nawawi/closure-compiler,nawawi/closure-compiler,monetate/closure-compiler,google/closure-compiler,ChadKillingsworth/closure-compiler,nawawi/closure-compiler,ChadKillingsworth/closure-compiler,monetate/closure-compiler,ChadKillingsworth/closure-compiler,google/closure-compiler,monetate/closure-compiler,monetate/closure-compiler,nawawi/closure-compiler,google/closure-compiler