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 e645f8115f0924e213ef8c49be171cf72277f641..6bc4440c596db8a4ecd181bd7f8aab11c1002e95 100644
--- a/remoting/host/remoting_me2me_host.cc
+++ b/remoting/host/remoting_me2me_host.cc
@@ -547,7 +547,10 @@ 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)