Remove ViEChannel::StartSend deadlock suppression.

No longer lock-order inverting since RTP/RTCP modules are instantiated
on construction and no longer guarded by a separate lock.

BUG=webrtc:2999
R=stefan@webrtc.org

Review URL: https://codereview.webrtc.org/1347283004 .

Cr-Commit-Position: refs/heads/master@{#10034}
diff --git a/webrtc/build/sanitizers/tsan_suppressions_webrtc.cc b/webrtc/build/sanitizers/tsan_suppressions_webrtc.cc
index 4b4cba0..5173b33 100644
--- a/webrtc/build/sanitizers/tsan_suppressions_webrtc.cc
+++ b/webrtc/build/sanitizers/tsan_suppressions_webrtc.cc
@@ -73,7 +73,6 @@
 "deadlock:webrtc::RTCPReceiver::SetSsrcs\n"
 "deadlock:webrtc::test::UdpSocketManagerPosixImpl::RemoveSocket\n"
 "deadlock:webrtc::vcm::VideoReceiver::RegisterPacketRequestCallback\n"
-"deadlock:webrtc::ViEChannel::StartSend\n"
 "deadlock:webrtc::ViEEncoder::OnLocalSsrcChanged\n"
 
 // TODO(pbos): Trace events are racy due to lack of proper POD atomics.