Move PolicyMap and its dependencies to components/policy/.

chrome/browser/policy/external_data_manager.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_POLICY_EXTERNAL_DATA_MANAGER_H_
-#define CHROME_BROWSER_POLICY_EXTERNAL_DATA_MANAGER_H_
-
-#include <string>
-
-#include "chrome/browser/policy/external_data_fetcher.h"
-
-namespace policy {
-
-// Downloads, verifies, caches and retrieves external data referenced by
-// policies.
-// An implementation of this abstract interface should be provided for each
-// policy source (cloud policy, platform policy) that supports external data
-// references.
-class ExternalDataManager {
- public:
-  // Retrieves the external data referenced by |policy| and invokes |callback|
-  // with the result. If |policy| does not reference any external data, the
-  // |callback| is invoked with a NULL pointer. Otherwise, the |callback| is
-  // invoked with the referenced data once it has been successfully retrieved.
-  // If retrieval is temporarily impossible (e.g. no network connectivity), the
-  // |callback| will be invoked when the temporary hindrance is resolved. If
-  // retrieval is permanently impossible (e.g. |policy| references data that
-  // does not exist on the server), the |callback| will never be invoked.
-  virtual void Fetch(const std::string& policy,
-                     const ExternalDataFetcher::FetchCallback& callback) = 0;
-};
-
-}  // namespace policy
-
-#endif  // CHROME_BROWSER_POLICY_EXTERNAL_DATA_MANAGER_H_