Unwind WebRTC DTLS 1.2 flag and field trial.

content/renderer/media/webrtc/peer_connection_dependency_factory.cc

Index: content/renderer/media/webrtc/peer_connection_dependency_factory.cc
diff --git a/content/renderer/media/webrtc/peer_connection_dependency_factory.cc b/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
index d98b2ac06daea95a5e831306093058b153718064..df31b7cdbf2fa37ce47435d0d500307e256c468f 100644
--- a/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
+++ b/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
@@ -257,13 +257,6 @@ void PeerConnectionDependencyFactory::InitializeSignalingThread(
   factory_options.disable_encryption =
       cmd_line->HasSwitch(switches::kDisableWebRtcEncryption);
 
-  // DTLS 1.2 is the default now but could be changed to 1.0 by the experiment.
-  factory_options.ssl_max_version = rtc::SSL_PROTOCOL_DTLS_12;
-  std::string group_name =
-      base::FieldTrialList::FindFullName("WebRTC-PeerConnectionDTLS1.2");
-  if (StartsWith(group_name, "Control", base::CompareCase::SENSITIVE))
-    factory_options.ssl_max_version = rtc::SSL_PROTOCOL_DTLS_10;
-
   pc_factory_->SetOptions(factory_options);
 
   event->Signal();