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

remoting/host/remoting_me2me_host.cc

Index: remoting/host/remoting_me2me_host.cc
diff --git a/remoting/host/remoting_me2me_host.cc b/remoting/host/remoting_me2me_host.cc
index dcdce593efb555a781b280d460b060475b5383da..f5089b299e30fa9ab617e7215c6b9bdc2b8e23ec 100644
--- a/remoting/host/remoting_me2me_host.cc
+++ b/remoting/host/remoting_me2me_host.cc
@@ -548,7 +548,10 @@ bool HostProcess::OnMessageReceived(const IPC::Message& message) {
                         DesktopSessionConnector::OnTerminalDisconnected)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
+
+  CHECK(handled) << "Received unexpected IPC type: " << message.type();
   return handled;
+
 #else  // !defined(REMOTING_MULTI_PROCESS)
   return false;
 #endif  // !defined(REMOTING_MULTI_PROCESS)