Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/net/pref_proxy_config_tracker_impl.h

Index: chrome/browser/net/pref_proxy_config_tracker_impl.h
diff --git a/chrome/browser/net/pref_proxy_config_tracker_impl.h b/chrome/browser/net/pref_proxy_config_tracker_impl.h
index 9157f55c3a9e0de825a6e7c845df751dcffe6015..d37c01c732e2c469ee98c4032af15438129a0bab 100644
--- a/chrome/browser/net/pref_proxy_config_tracker_impl.h
+++ b/chrome/browser/net/pref_proxy_config_tracker_impl.h
@@ -15,6 +15,8 @@
 #include "net/proxy/proxy_config_service.h"
 
 class PrefService;
+class PrefServiceSimple;
+class PrefServiceSyncable;
 
 // A net::ProxyConfigService implementation that applies preference proxy
 // settings (pushed from PrefProxyConfigTrackerImpl) as overrides to the proxy
@@ -116,8 +118,10 @@ class PrefProxyConfigTrackerImpl {
   static bool PrefConfigToNetConfig(const ProxyConfigDictionary& proxy_dict,
                                     net::ProxyConfig* config);
 
-  // Registers the proxy preference.
-  static void RegisterPrefs(PrefService* user_prefs);
+  // Registers the proxy preferences. These are actually registered
+  // the same way in local state and in user prefs.
+  static void RegisterPrefs(PrefServiceSimple* local_state);
+  static void RegisterUserPrefs(PrefServiceSyncable* user_prefs);
 
  protected:
   // Get the proxy configuration currently defined by preferences.