Improve handling of NONE transport in channel configuration.

remoting/host/chromoting_host.cc

Index: remoting/host/chromoting_host.cc
diff --git a/remoting/host/chromoting_host.cc b/remoting/host/chromoting_host.cc
index d81d4402214785cf51d89b1287f9a14f0037a3c3..4ef9de11deb281baf3f187298590374f425ea41e 100644
--- a/remoting/host/chromoting_host.cc
+++ b/remoting/host/chromoting_host.cc
@@ -88,9 +88,7 @@ ChromotingHost::ChromotingHost(
     // with the NONE config.
     protocol_config_->mutable_audio_configs()->clear();
     protocol_config_->mutable_audio_configs()->push_back(
-        protocol::ChannelConfig(protocol::ChannelConfig::TRANSPORT_NONE,
-                                protocol::kDefaultStreamVersion,
-                                protocol::ChannelConfig::CODEC_VERBATIM));
+        protocol::ChannelConfig());
   }
 }