Remove incorrect FIXME in MediaDevices.idl
The FIXME in MediaDevices.idl that says:
// FIXME 169871: should be subclass of EventTarget
is out of date and incorrect. The interface is a subclass of EventTarget.
Created attachment 408651 [details]
Committed r267006: <https://trac.webkit.org/changeset/267006>
All reviewed patches have been landed. Closing bug and clearing flags on attachment 408651 [details].