Componentize proxy_policy_handler from chrome/browser/net

chrome/browser/net/proxy_policy_handler.h

-// Copyright 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_NET_PROXY_POLICY_HANDLER_H_
-#define CHROME_BROWSER_NET_PROXY_POLICY_HANDLER_H_
-
-#include <string>
-
-#include "base/basictypes.h"
-#include "components/policy/core/browser/configuration_policy_handler.h"
-
-namespace policy {
-
-class ProxyMap;
-class ProxyErrorMap;
-
-// ConfigurationPolicyHandler for the proxy policies.
-class ProxyPolicyHandler : public ConfigurationPolicyHandler {
- public:
-  // Constants for the "Proxy Server Mode" defined in the policies.
-  // Note that these diverge from internal presentation defined in
-  // ProxyPrefs::ProxyMode for legacy reasons. The following four
-  // PolicyProxyModeType types were not very precise and had overlapping use
-  // cases.
-  enum ProxyModeType {
-    // Disable Proxy, connect directly.
-    PROXY_SERVER_MODE = 0,
-    // Auto detect proxy or use specific PAC script if given.
-    PROXY_AUTO_DETECT_PROXY_SERVER_MODE = 1,
-    // Use manually configured proxy servers (fixed servers).
-    PROXY_MANUALLY_CONFIGURED_PROXY_SERVER_MODE = 2,
-    // Use system proxy server.
-    PROXY_USE_SYSTEM_PROXY_SERVER_MODE = 3,
-
-    MODE_COUNT
-  };
-
-  ProxyPolicyHandler();
-  ~ProxyPolicyHandler() override;
-
-  // ConfigurationPolicyHandler methods:
-  bool CheckPolicySettings(const PolicyMap& policies,
-                           PolicyErrorMap* errors) override;
-  void ApplyPolicySettings(const PolicyMap& policies,
-                           PrefValueMap* prefs) override;
-
- private:
-  const base::Value* GetProxyPolicyValue(const PolicyMap& policies,
-                                         const char* policy_name);
-
-  // Converts the deprecated ProxyServerMode policy value to a ProxyMode value
-  // and places the result in |mode_value|. Returns whether the conversion
-  // succeeded.
-  bool CheckProxyModeAndServerMode(const PolicyMap& policies,
-                                   PolicyErrorMap* errors,
-                                   std::string* mode_value);
-
-  DISALLOW_COPY_AND_ASSIGN(ProxyPolicyHandler);
-};
-
-}  // namespace policy
-
-#endif  // CHROME_BROWSER_NET_PROXY_POLICY_HANDLER_H_