Move ProxyServiceFactory to components/proxy_service/ios.

ios/chrome/browser/net/proxy_service_factory.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 IOS_CHROME_BROWSER_NET_PROXY_SERVICE_FACTORY_H_
-#define IOS_CHROME_BROWSER_NET_PROXY_SERVICE_FACTORY_H_
-
-#include <memory>
-
-#include "base/macros.h"
-
-class PrefProxyConfigTracker;
-class PrefService;
-
-namespace net {
-class NetLog;
-class NetworkDelegate;
-class ProxyConfigService;
-class ProxyService;
-class URLRequestContext;
-}
-
-namespace ios {
-
-class ProxyServiceFactory {
- public:
-  // Creates a ProxyConfigService that delivers the system preferences.
-  static std::unique_ptr<net::ProxyConfigService> CreateProxyConfigService(
-      PrefProxyConfigTracker* tracker);
-
-  // Creates a PrefProxyConfigTracker that tracks browser state preferences.
-  static std::unique_ptr<PrefProxyConfigTracker>
-  CreatePrefProxyConfigTrackerOfProfile(PrefService* browser_state_prefs,
-                                        PrefService* local_state_prefs);
-
-  // Creates a PrefProxyConfigTracker that tracks local state only. This tracker
-  // should be used for the system request context.
-  static std::unique_ptr<PrefProxyConfigTracker>
-  CreatePrefProxyConfigTrackerOfLocalState(PrefService* local_state_prefs);
-
-  // Create a proxy service.
-  static std::unique_ptr<net::ProxyService> CreateProxyService(
-      net::NetLog* net_log,
-      net::URLRequestContext* context,
-      net::NetworkDelegate* network_delegate,
-      std::unique_ptr<net::ProxyConfigService> proxy_config_service,
-      bool quick_check_enabled);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ProxyServiceFactory);
-};
-
-}  // namespace ios
-
-#endif  // IOS_CHROME_BROWSER_NET_PROXY_SERVICE_FACTORY_H_