Automated IWYU fix for TaskRunner includes.

components/wifi/fake_wifi_service.h

 // Copyright 2014 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 COMPONENTS_WIFI_FAKE_WIFI_SERVICE_H_
 #define COMPONENTS_WIFI_FAKE_WIFI_SERVICE_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
+#include "base/single_thread_task_runner.h"
 #include "components/wifi/network_properties.h"
 #include "components/wifi/wifi_service.h"
 
 namespace wifi {
 
 // Fake implementation of WiFiService used to satisfy expectations of
 // networkingPrivateApi browser test.
 class FakeWiFiService : public WiFiService {
  public:
   FakeWiFiService();
@@ skipping 52 matching lines @@
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   NetworkGuidListCallback networks_changed_observer_;
   NetworkGuidListCallback network_list_changed_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeWiFiService);
 };
 
 }  // namespace wifi
 
 #endif  // COMPONENTS_WIFI_FAKE_WIFI_SERVICE_H_