Crash the network or desktop process when an unknown IPC message is received.

remoting/host/remoting_me2me_host.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.
 //
 // This file implements a standalone host process for Me2Me.
 
 #include <string>
 
 #include "base/at_exit.h"
 #include "base/bind.h"
@@ skipping 529 matching lines @@
                         OnConfigUpdated)
     IPC_MESSAGE_FORWARD(
         ChromotingDaemonNetworkMsg_DesktopAttached,
         desktop_session_connector_,
         DesktopSessionConnector::OnDesktopSessionAgentAttached)
     IPC_MESSAGE_FORWARD(ChromotingDaemonNetworkMsg_TerminalDisconnected,
                         desktop_session_connector_,
                         DesktopSessionConnector::OnTerminalDisconnected)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
+
+  CHECK(handled) << "An unexpected IPC message received: type="
+                 << message.type();
   return handled;
+
 #else  // !defined(REMOTING_MULTI_PROCESS)
   return false;
 #endif  // !defined(REMOTING_MULTI_PROCESS)
 }
 
 void HostProcess::OnChannelError() {
   DCHECK(context_->ui_task_runner()->BelongsToCurrentThread());
 
   // Shutdown the host if the daemon process disconnects the IPC channel.
   context_->network_task_runner()->PostTask(
@@ skipping 539 matching lines @@
   return exit_code;
 }
 
 }  // namespace remoting
 
 #if !defined(OS_WIN)
 int main(int argc, char** argv) {
   return remoting::HostMain(argc, argv);
 }
 #endif  // !defined(OS_WIN)