Remove PrefServiceSimple, replacing it with PrefService and PrefRegistrySimple.

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 d37c01c732e2c469ee98c4032af15438129a0bab..57d09554fc8d0fdc6f1e655c92856fccb7e763b2 100644
--- a/chrome/browser/net/pref_proxy_config_tracker_impl.h
+++ b/chrome/browser/net/pref_proxy_config_tracker_impl.h
@@ -15,7 +15,7 @@
 #include "net/proxy/proxy_config_service.h"
 
 class PrefService;
-class PrefServiceSimple;
+class PrefRegistrarSimple;
 class PrefServiceSyncable;
 
 // A net::ProxyConfigService implementation that applies preference proxy
@@ -120,7 +120,7 @@ class PrefProxyConfigTrackerImpl {
 
   // 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 RegisterPrefs(PrefRegistrarSimple* local_state);
   static void RegisterUserPrefs(PrefServiceSyncable* user_prefs);
 
  protected: