Automated IWYU fix for TaskRunner includes.

chrome/browser/devtools/device/cast_device_provider.cc

 // 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.
 
 #include "chrome/browser/devtools/device/cast_device_provider.h"
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
+#include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "chrome/browser/local_discovery/service_discovery_shared_client.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/ip_address.h"
 
 using local_discovery::ServiceDescription;
 using local_discovery::ServiceDiscoveryDeviceLister;
 using local_discovery::ServiceDiscoverySharedClient;
@@ skipping 174 matching lines @@
   const std::string& hostname = it->second;
   device_info_map_.erase(hostname);
   service_hostname_map_.erase(it);
 }
 
 void CastDeviceProvider::OnDeviceCacheFlushed() {
   VLOG(1) << "Device cache flushed";
   service_hostname_map_.clear();
   device_info_map_.clear();
 }