Automated IWYU fix for TaskRunner includes.

services/service_manager/public/cpp/service_context_ref.cc

 // Copyright 2016 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 "services/service_manager/public/cpp/service_context_ref.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "base/threading/thread_checker.h"
 #include "base/threading/thread_task_runner_handle.h"
 
 namespace service_manager {
 
 class ServiceContextRefImpl : public ServiceContextRef {
  public:
   ServiceContextRefImpl(
       base::WeakPtr<ServiceContextRefFactory> factory,
       scoped_refptr<base::SingleThreadTaskRunner> service_task_runner)
@@ skipping 54 matching lines @@
 void ServiceContextRefFactory::AddRef() {
   ++ref_count_;
 }
 
 void ServiceContextRefFactory::Release() {
   if (!--ref_count_)
     quit_closure_.Run();
 }
 
 }  // namespace service_manager