Automated IWYU fix for TaskRunner includes.

headless/lib/browser/headless_url_request_context_getter.h

 // Copyright 2015 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 HEADLESS_LIB_BROWSER_HEADLESS_URL_REQUEST_CONTEXT_GETTER_H_
 #define HEADLESS_LIB_BROWSER_HEADLESS_URL_REQUEST_CONTEXT_GETTER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/single_thread_task_runner.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/content_browser_client.h"
 #include "headless/public/headless_browser.h"
 #include "net/proxy/proxy_config_service.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "net/url_request/url_request_job_factory.h"
 
 namespace net {
 class HostResolver;
 class ProxyConfigService;
@@ skipping 39 matching lines @@
   content::ProtocolHandlerMap protocol_handlers_;
   content::URLRequestInterceptorScopedVector request_interceptors_;
   net::NetLog* net_log_;  // Not owned.
 
   DISALLOW_COPY_AND_ASSIGN(HeadlessURLRequestContextGetter);
 };
 
 }  // namespace headless
 
 #endif  // HEADLESS_LIB_BROWSER_HEADLESS_URL_REQUEST_CONTEXT_GETTER_H_