Update linux host to handle SIGHUP. use it to reload config.

remoting/host/posix/sighup_listener.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.
 
 // TODO(jamiewalch): Add unit tests for this.
 
-#include "remoting/host/sighup_listener_mac.h"
+#include "remoting/host/posix/sighup_listener.h"
 
 #include <errno.h>
+#include <signal.h>
 
 #include "base/compiler_specific.h"
 #include "base/eintr_wrapper.h"
 #include "base/message_loop.h"
 #include "base/message_pump_libevent.h"
 #include "base/threading/platform_thread.h"
 
 namespace {
 
 class SigHupListener : public base::MessagePumpLibevent::Watcher {
@@ skipping 64 matching lines @@
   if (signal(SIGHUP, HupSignalHandler) == SIG_ERR) {
     delete g_config_updater;
     g_config_updater = NULL;
     LOG(ERROR) << "signal() failed: " << errno;
     return false;
   }
   return true;
 }
 
 }  // namespace remoting