Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/chromeos/proxy_config_service_impl.h

 // Copyright (c) 2012 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_PROXY_CONFIG_SERVICE_IMPL_H_
 #define CHROME_BROWSER_CHROMEOS_PROXY_CONFIG_SERVICE_IMPL_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/prefs/public/pref_member.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/cros/network_library.h"
 #include "chrome/browser/net/pref_proxy_config_tracker_impl.h"
 
+class PrefRegistrySimple;
+class PrefRegistrySyncable;
+
 namespace chromeos {
 
 // Implementation of proxy config service for chromeos that:
 // - extends PrefProxyConfigTrackerImpl (and so lives and runs entirely on UI
 //   thread) to handle proxy from prefs (via PrefProxyConfigTrackerImpl) and
 //   system i.e. network (via shill notifications)
 // - exists one per profile and one per local state
 // - retrieves initial system proxy configuration from cros settings persisted
 //   on chromeos device from chromeos revisions before migration to shill,
 // - persists proxy setting per network in flimflim
@@ skipping 166 matching lines @@
   virtual void OnNetworkChanged(NetworkLibrary* cros,
                                 const Network* network) OVERRIDE;
 
   // Parse |network| proxy config and store result in |proxy_config|.
   // Returns true if proxy config was successfully parsed.
   static bool ParseProxyConfig(const Network* network,
                                net::ProxyConfig* proxy_config);
 
   // Register UseShardProxies preference.
   static void RegisterPrefs(PrefRegistrySimple* registry);
-  static void RegisterUserPrefs(PrefServiceSyncable* pref_service);
+  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
 
 #if defined(UNIT_TEST)
   void SetTesting(ProxyConfig* test_config) {
     UIMakeActiveNetworkCurrent();
     if (test_config) {
       std::string value;
       test_config->SerializeForNetwork(&value);
       SetProxyConfigForNetwork(active_network_, value, false);
     }
   }
@@ skipping 81 matching lines @@
   std::vector<base::Closure> callbacks_;
 
   base::WeakPtrFactory<ProxyConfigServiceImpl> pointer_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyConfigServiceImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_PROXY_CONFIG_SERVICE_IMPL_H_