Move code in src/remoting to the new callbacks.

remoting/host/local_input_monitor_thread_linux.cc

 // Copyright (c) 2011 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 "remoting/host/local_input_monitor_thread_linux.h"
 
 #include <sys/select.h>
 #include <unistd.h>
 #define XK_MISCELLANY
 #include <X11/keysymdef.h>
@@ skipping 155 matching lines @@
   host_->LocalMouseMoved(pos);
 }
 
 void LocalInputMonitorThread::LocalKeyPressed(int key_code, bool down) {
   int key_sym = XKeycodeToKeysym(display_, key_code, 0);
   if (key_sym == XK_Control_L || key_sym == XK_Control_R) {
     ctrl_pressed_ = down;
   } else if (key_sym == XK_Alt_L || key_sym == XK_Alt_R) {
     alt_pressed_ = down;
   } else if (alt_pressed_ && ctrl_pressed_ && key_sym == XK_Escape && down) {
-    host_->Shutdown(NULL);
+    host_->Shutdown(base::Closure());
   }
 }
 
 }  // namespace remoting