Revert of Pick the DTLS handshake timeout based on the ICE RTT estimate

webrtc/p2p/base/p2ptransportchannel.cc

Index: webrtc/p2p/base/p2ptransportchannel.cc
diff --git a/webrtc/p2p/base/p2ptransportchannel.cc b/webrtc/p2p/base/p2ptransportchannel.cc
index 2c7d9211130f4d8374d4f28ca8c57c6c0d486f5e..f47f03bbd64f7276e7887f152941539799c80c22 100644
--- a/webrtc/p2p/base/p2ptransportchannel.cc
+++ b/webrtc/p2p/base/p2ptransportchannel.cc
@@ -274,15 +274,6 @@
 
 IceTransportState P2PTransportChannel::GetState() const {
   return state_;
-}
-
-rtc::Optional<int> P2PTransportChannel::GetRttEstimate() {
-  if (selected_connection_ != nullptr
-      && selected_connection_->rtt_samples() > 0) {
-    return rtc::Optional<int>(selected_connection_->rtt());
-  } else {
-    return rtc::Optional<int>();
-  }
 }
 
 // A channel is considered ICE completed once there is at most one active