[Mirroring Service] Delete wontfix TODO

This TODO isn't going to be completed, so deleting it from source.

Bug: 1015461
Change-Id: I5dbfbbf9751cd8fb089614138d5759a668f08523
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2258682Reviewed-by: Alex Gough <ajgo@chromium.org>
Commit-Queue: Jordan Bayles <jophba@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781378}

components/mirroring/mojom/mirroring_service_host.mojom

@@ -20,7 +20,4 @@ interface MirroringServiceHost {
         pending_remote<SessionObserver> observer,
         pending_remote<CastMessageChannel> outbound_channel,
         pending_receiver<CastMessageChannel> inbound_channel);
-
-  // TODO(crbug.com/1015461): Add interfaces to get the streaming events/stats
-  // and mirroring logs.
 };