Merge to M57: Only set certificate on DTLS transport if fingerprint is found in SDP.

webrtc/p2p/base/jseptransport.cc

Index: webrtc/p2p/base/jseptransport.cc
diff --git a/webrtc/p2p/base/jseptransport.cc b/webrtc/p2p/base/jseptransport.cc
index c3d6755056706c6215078d71506d26db43984aa1..3456219acf6392d67430ac66c9f8d31412d740b1 100644
--- a/webrtc/p2p/base/jseptransport.cc
+++ b/webrtc/p2p/base/jseptransport.cc
@@ -328,7 +328,12 @@ bool JsepTransport::ApplyLocalTransportDescription(
     TransportChannelImpl* channel,
     std::string* error_desc) {
   channel->SetIceParameters(local_description_->GetIceParameters());
-  return true;
+  bool ret = true;
+  if (certificate_) {
+    ret = channel->SetLocalCertificate(certificate_);
+    RTC_DCHECK(ret);
+  }
+  return ret;
 }
 
 bool JsepTransport::ApplyRemoteTransportDescription(