Remove RTP data implementation

Bug: webrtc:6625
Change-Id: Ie68d7a938d8b7be95a01cca74a176104e4e44e1b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/215321
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33759}
diff --git a/pc/peer_connection_data_channel_unittest.cc b/pc/peer_connection_data_channel_unittest.cc
index 604ad40..eacd8c4 100644
--- a/pc/peer_connection_data_channel_unittest.cc
+++ b/pc/peer_connection_data_channel_unittest.cc
@@ -330,8 +330,9 @@
 
   auto answer = callee->CreateAnswer();
   ChangeSctpPortOnDescription(answer->description(), kNewRecvPort);
+  std::string sdp;
+  answer->ToString(&sdp);
   ASSERT_TRUE(callee->SetLocalDescription(std::move(answer)));
-
   auto* callee_transport =
       callee->sctp_transport_factory()->last_fake_sctp_transport();
   ASSERT_TRUE(callee_transport);