Remove unnecessary set_stream_ids call

Both AudioRtpSender and VideoRtpSender receive stream_ids in their
constructor, no need to call set_stream_ids again.

Bug: None
Change-Id: I6238a6d6e31076a0b3245c89e2825d8dee5166c0
Reviewed-on: https://webrtc-review.googlesource.com/80220
Reviewed-by: Taylor Brandstetter <deadbeef@webrtc.org>
Commit-Queue: Taylor Brandstetter <deadbeef@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23476}
diff --git a/pc/peerconnection.cc b/pc/peerconnection.cc
index 58a35c4..40aced4 100644
--- a/pc/peerconnection.cc
+++ b/pc/peerconnection.cc
@@ -1429,7 +1429,6 @@
                            stream_ids));
     NoteUsageEvent(UsageEvent::VIDEO_ADDED);
   }
-  sender->internal()->set_stream_ids(stream_ids);
   return sender;
 }