Fix crash when user disconnects It2Me host

remoting/host/it2me/it2me_native_messaging_host.h

 // Copyright 2013 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.
 
 #ifndef REMOTING_HOST_IT2ME_IT2ME_NATIVE_MESSAGING_HOST_H_
 #define REMOTING_HOST_IT2ME_IT2ME_NATIVE_MESSAGING_HOST_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "build/build_config.h"
 #include "extensions/browser/api/messaging/native_message_host.h"
 #include "remoting/host/it2me/it2me_host.h"
+#include "remoting/signaling/delegating_signal_strategy.h"
 
 #if !defined(OS_CHROMEOS)
 #include "remoting/host/native_messaging/log_message_handler.h"
 #endif
 
 namespace base {
 class DictionaryValue;
 class Value;
 class SingleThreadTaskRunner;
 }  // namespace base
 
 namespace remoting {
 
 class ChromotingHostContext;
-class DelegatingSignalStrategy;
 class ElevatedNativeMessagingHost;
 class PolicyWatcher;
 
 // Implementation of the native messaging host process.
 class It2MeNativeMessagingHost : public It2MeHost::Observer,
                                  public extensions::NativeMessageHost {
  public:
   It2MeNativeMessagingHost(bool needs_elevation,
                            policy::PolicyService* policy_service,
                            std::unique_ptr<ChromotingHostContext> host_context,
@@ skipping 45 matching lines @@
   bool needs_elevation_ = false;
 
 #if defined(OS_WIN)
   // Controls the lifetime of the elevated native messaging host process.
   // Note: 'elevated' in this instance means having the UiAccess privilege, not
   // being run as a higher privilege user.
   std::unique_ptr<ElevatedNativeMessagingHost> elevated_host_;
 #endif  // defined(OS_WIN)
 
   Client* client_ = nullptr;
-  DelegatingSignalStrategy* delegating_signal_strategy_ = nullptr;
+  DelegatingSignalStrategy::IqCallback incoming_message_callback_;
   std::unique_ptr<ChromotingHostContext> host_context_;
   std::unique_ptr<It2MeHostFactory> factory_;
   scoped_refptr<It2MeHost> it2me_host_;
 
 #if !defined(OS_CHROMEOS)
   // Don't install a log message handler on ChromeOS because we run in the
   // browser process and don't want to intercept all its log messages.
   std::unique_ptr<LogMessageHandler> log_message_handler_;
 #endif
 
@@ skipping 21 matching lines @@
 
   base::WeakPtr<It2MeNativeMessagingHost> weak_ptr_;
   base::WeakPtrFactory<It2MeNativeMessagingHost> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(It2MeNativeMessagingHost);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_IT2ME_IT2ME_NATIVE_MESSAGING_HOST_H_