Removing outdated tests.

Some of them break downstream projects.

Bug: None
Change-Id: I826af4a768115649d29a4f0a70f895fe3cad0c71
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/156167
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Commit-Queue: Alex Loiko <aleloi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29418}
diff --git a/pc/channel_unittest.cc b/pc/channel_unittest.cc
index 3565569..d53b901 100644
--- a/pc/channel_unittest.cc
+++ b/pc/channel_unittest.cc
@@ -1937,10 +1937,6 @@
   Base::SendRtpToRtp();
 }
 
-TEST_F(VoiceChannelDoubleThreadTest, SendRtcpToRtcp) {
-  Base::SendRtcpToRtcp();
-}
-
 TEST_F(VoiceChannelDoubleThreadTest, SendDtlsSrtpToDtlsSrtp) {
   Base::SendDtlsSrtpToDtlsSrtp(0, 0);
 }
@@ -2377,10 +2373,6 @@
   Base::SendRtpToRtp();
 }
 
-TEST_F(VideoChannelDoubleThreadTest, SendRtcpToRtcp) {
-  Base::SendRtcpToRtcp();
-}
-
 TEST_F(VideoChannelDoubleThreadTest, SendDtlsSrtpToDtlsSrtp) {
   Base::SendDtlsSrtpToDtlsSrtp(0, 0);
 }
@@ -2649,10 +2641,6 @@
   Base::SendRtpToRtp();
 }
 
-TEST_F(RtpDataChannelDoubleThreadTest, SendRtcpToRtcp) {
-  Base::SendRtcpToRtcp();
-}
-
 TEST_F(RtpDataChannelDoubleThreadTest, SendRtpToRtpOnThread) {
   Base::SendRtpToRtpOnThread();
 }