Fix cyclic dependency between ProfilePolicyConnector and PrefService.

chrome/browser/chromeos/policy/network_policy_service_factory.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_CHROMEOS_POLICY_NETWORK_POLICY_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_CHROMEOS_POLICY_NETWORK_POLICY_SERVICE_FACTORY_H_
+
+#include "components/browser_context_keyed_service/browser_context_keyed_service_factory.h"
+
+template <typename T> struct DefaultSingletonTraits;
+
+class Profile;
+
+namespace policy {
+
+class NetworkPolicyService;
+
+// Singleton that owns all FaviconService and associates them with
+// Profiles.
+class NetworkPolicyServiceFactory : public BrowserContextKeyedServiceFactory {
+ public:
+  static NetworkPolicyService* GetForProfile(Profile* profile);
+  static NetworkPolicyServiceFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<NetworkPolicyServiceFactory>;
+
+  NetworkPolicyServiceFactory();
+  virtual ~NetworkPolicyServiceFactory();
+
+  // BrowserContextKeyedServiceFactory:
+  virtual content::BrowserContext* GetBrowserContextToUse(
+      content::BrowserContext* context) const OVERRIDE;
+  virtual BrowserContextKeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* profile) const OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(NetworkPolicyServiceFactory);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_CHROMEOS_POLICY_NETWORK_POLICY_SERVICE_FACTORY_H_