Automated IWYU fix for TaskRunner includes.

remoting/host/win/session_desktop_environment.h

 // 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.
 
 #ifndef REMOTING_HOST_WIN_SESSION_DESKTOP_ENVIRONMENT_H_
 #define REMOTING_HOST_WIN_SESSION_DESKTOP_ENVIRONMENT_H_
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/single_thread_task_runner.h"
 #include "remoting/host/me2me_desktop_environment.h"
 
 namespace remoting {
 
 // Used to create audio/video capturers and event executor that are compatible
 // with Windows sessions.
 class SessionDesktopEnvironment : public Me2MeDesktopEnvironment {
  public:
   ~SessionDesktopEnvironment() override;
 
@@ skipping 43 matching lines @@
 
   // Used to lock the workstation for the current session.
   base::Closure lock_workstation_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionDesktopEnvironmentFactory);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_WIN_SESSION_DESKTOP_ENVIRONMENT_H_