Implementation and fixes for Blimp client/engine E2E communication.

blimp/net/blimp_message_demultiplexer.cc

 // Copyright 2015 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 "blimp/net/blimp_message_demultiplexer.h"
 
 #include <string>
 
 #include "base/strings/stringprintf.h"
 #include "net/base/net_errors.h"
@@ skipping 19 matching lines @@
   } else {
     DLOG(FATAL) << "Handler already registered for type=" << type << ".";
   }
 }
 
 void BlimpMessageDemultiplexer::ProcessMessage(
     scoped_ptr<BlimpMessage> message,
     const net::CompletionCallback& callback) {
   auto receiver_iter = feature_receiver_map_.find(message->type());
   if (receiver_iter == feature_receiver_map_.end()) {
-    DLOG(FATAL) << "No registered receiver for "
+    DLOG(ERROR) << "No registered receiver for "
                 << BlimpMessageToDebugString(*message) << ".";
     if (!callback.is_null()) {
       callback.Run(net::ERR_NOT_IMPLEMENTED);
     }
+    return;
   }
 
   receiver_iter->second->ProcessMessage(std::move(message), callback);
 }
 
 }  // namespace blimp