[WinCairo][MediaFoundation] Remove the unused video window
Remove the video window which has been unused since Bug 150941.
Created attachment 371262 [details]
Created attachment 371571 [details]
Created attachment 371573 [details]
Comment on attachment 371573 [details]
Clearing flags on attachment: 371573
Committed r246302: <https://trac.webkit.org/changeset/246302>
All reviewed patches have been landed. Closing bug.