Add command line flag --disable-webrtc-encryption for dev and canary channels

content/renderer/media/rtc_peer_connection_handler.cc

Index: content/renderer/media/rtc_peer_connection_handler.cc
diff --git a/content/renderer/media/rtc_peer_connection_handler.cc b/content/renderer/media/rtc_peer_connection_handler.cc
index 127a7e23fcd5fed93bd5cd41ef317dd6e8c643b7..69b1eddf2f0c1875a505f1d41e09b85a2ec072f2 100644
--- a/content/renderer/media/rtc_peer_connection_handler.cc
+++ b/content/renderer/media/rtc_peer_connection_handler.cc
@@ -357,6 +357,12 @@ bool RTCPeerConnectionHandler::initialize(
         webrtc::MediaConstraintsInterface::kEnableSctpDataChannels, "true");
   }
 
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kDisableWebRtcEncryption)) {
+    constraints.AddOptional(
+        webrtc::MediaConstraintsInterface::kInternalDisableEncryption, "true");
+  }
+
   native_peer_connection_ =
       dependency_factory_->CreatePeerConnection(
           servers, &constraints, frame_, this);