Don't print out extension message data if unrecognized.

remoting/host/client_session.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/host/client_session.h"
 
 #include <algorithm>
 
 #include "base/message_loop/message_loop_proxy.h"
 #include "remoting/base/capabilities.h"
@@ skipping 217 matching lines @@
       connection_->client_stub()->DeliverHostMessage(reply);
       return;
     } else if (message.type() == "gnubby-auth") {
       if (gnubby_auth_handler_) {
         gnubby_auth_handler_->DeliverClientMessage(message.data());
       } else {
         HOST_LOG << "gnubby auth is not enabled";
       }
       return;
     } else {
-      extension_manager_->OnExtensionMessage(message);
-      return;
+      if (!extension_manager_->OnExtensionMessage(message))
+        return;
+
+      DLOG(INFO) << "Unexpected message received: "
+                 << message.type() << ": " << message.data();
     }
   }
-  HOST_LOG << "Unexpected message received: "
-            << message.type() << ": " << message.data();
 }
 
 void ClientSession::OnConnectionAuthenticating(
     protocol::ConnectionToClient* connection) {
   event_handler_->OnSessionAuthenticating(this);
 }
 
 void ClientSession::OnConnectionAuthenticated(
     protocol::ConnectionToClient* connection) {
   DCHECK(CalledOnValidThread());
@@ skipping 274 matching lines @@
     return scoped_ptr<AudioEncoder>(new AudioEncoderVerbatim());
   } else if (audio_config.codec == protocol::ChannelConfig::CODEC_OPUS) {
     return scoped_ptr<AudioEncoder>(new AudioEncoderOpus());
   }
 
   NOTREACHED();
   return scoped_ptr<AudioEncoder>();
 }
 
 }  // namespace remoting