Removing enum used for removed UMA metrics WebRTC.PeerConnection.Simulcast.ApplyLocalDescription and WebRTC.PeerConnection.Simulcast.ApplyRemoteDescription

This is pending work from this CL already merged: https://webrtc-review.googlesource.com/c/src/+/311640

Bug: chromium:1447193
Change-Id: I9b2ffb60d65f87f0497b099b6253bf122ff1d873
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/311740
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40428}
diff --git a/api/uma_metrics.h b/api/uma_metrics.h
index a63159e..925ba07 100644
--- a/api/uma_metrics.h
+++ b/api/uma_metrics.h
@@ -119,16 +119,6 @@
   kAddIceCandidateMax
 };
 
-// Metric for recording which api surface was used to enable simulcast.
-// These values are persisted to logs. Entries should not be renumbered and
-// numeric values should never be reused.
-enum SimulcastApiVersion {
-  kSimulcastApiVersionNone = 0,
-  kSimulcastApiVersionLegacy = 1,
-  kSimulcastApiVersionSpecCompliant = 2,
-  kSimulcastApiVersionMax
-};
-
 // Metrics for reporting usage of BUNDLE.
 // These values are persisted to logs. Entries should not be renumbered and
 // numeric values should never be reused.