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

remoting/host/daemon_process.cc

Index: remoting/host/daemon_process.cc
diff --git a/remoting/host/daemon_process.cc b/remoting/host/daemon_process.cc
index 98c94bb464f99dfe95539585bd71f41f2fbdd2ab..c82c96e5a0a00d5b5ec17bba9a4948e76f2acc73 100644
--- a/remoting/host/daemon_process.cc
+++ b/remoting/host/daemon_process.cc
@@ -98,6 +98,12 @@ bool DaemonProcess::OnMessageReceived(const IPC::Message& message) {
                         OnHostShutdown)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
+
+  if (!handled) {
+    LOG(ERROR) << "Received unexpected IPC type: " << message.type();
+    CrashNetworkProcess(FROM_HERE);
+  }
+
   return handled;
 }