Remove unused base/threading/worker_pool.h includes.

chromeos/network/proxy/proxy_config_service_impl.cc

 // 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.
 
 #include "chromeos/network/proxy/proxy_config_service_impl.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
-#include "base/threading/worker_pool.h"
 #include "base/values.h"
 #include "chromeos/network/network_profile.h"
 #include "chromeos/network/network_profile_handler.h"
 #include "chromeos/network/network_state.h"
 #include "chromeos/network/network_state_handler.h"
 #include "chromeos/network/onc/onc_utils.h"
 #include "chromeos/network/proxy/proxy_config_handler.h"
 #include "components/onc/onc_pref_names.h"
 #include "components/prefs/pref_service.h"
 #include "components/proxy_config/pref_proxy_config_tracker_impl.h"
@@ skipping 262 matching lines @@
       std::unique_ptr<base::DictionaryValue> config_dict(
           effective_config.ToValue());
       VLOG(1) << this << ": Proxy changed: "
               << ProxyPrefs::ConfigStateToDebugString(active_config_state_)
               << ", " << *config_dict;
     }
   }
 }
 
 }  // namespace chromeos