Move some proxy config code out of src/chrome

chrome/browser/chromeos/net/proxy_config_handler.h

-// Copyright (c) 2013 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 CHROME_BROWSER_CHROMEOS_NET_PROXY_CONFIG_HANDLER_H_
-#define CHROME_BROWSER_CHROMEOS_NET_PROXY_CONFIG_HANDLER_H_
-
-#include <memory>
-
-#include "components/onc/onc_constants.h"
-
-class PrefRegistrySimple;
-class PrefService;
-class ProxyConfigDictionary;
-
-namespace user_prefs {
-class PrefRegistrySyncable;
-}
-
-namespace chromeos {
-
-class NetworkState;
-
-namespace proxy_config {
-
-// Get the proxy configuration including per-network policies for network
-// |network|. If |profile_prefs| is NULL, then only shared settings (and device
-// policy) are respected. This is e.g. the case for the signin screen and the
-// system request context.
-std::unique_ptr<ProxyConfigDictionary> GetProxyConfigForNetwork(
-    const PrefService* profile_prefs,
-    const PrefService* local_state_prefs,
-    const NetworkState& network,
-    ::onc::ONCSource* onc_source);
-
-void SetProxyConfigForNetwork(const ProxyConfigDictionary& proxy_config,
-                              const NetworkState& network);
-
-}  // namespace proxy_config
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_NET_PROXY_CONFIG_HANDLER_H_