Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/net/predictor.cc

Index: chrome/browser/net/predictor.cc
diff --git a/chrome/browser/net/predictor.cc b/chrome/browser/net/predictor.cc
index d513126a837c13419d97ae2e3344372a67e99a16..88ddd6b0992e3392504a88538e622acd77a2564b 100644
--- a/chrome/browser/net/predictor.cc
+++ b/chrome/browser/net/predictor.cc
@@ -23,6 +23,7 @@
 #include "base/values.h"
 #include "chrome/browser/io_thread.h"
 #include "chrome/browser/net/preconnect.h"
+#include "chrome/browser/prefs/pref_registry_syncable.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/browser/prefs/session_startup_pref.h"
@@ -154,11 +155,11 @@ Predictor* Predictor::CreatePredictor(bool preconnect_enabled,
   return new Predictor(preconnect_enabled);
 }
 
-void Predictor::RegisterUserPrefs(PrefServiceSyncable* user_prefs) {
-  user_prefs->RegisterListPref(prefs::kDnsPrefetchingStartupList,
-                               PrefServiceSyncable::UNSYNCABLE_PREF);
-  user_prefs->RegisterListPref(prefs::kDnsPrefetchingHostReferralList,
-                               PrefServiceSyncable::UNSYNCABLE_PREF);
+void Predictor::RegisterUserPrefs(PrefRegistrySyncable* registry) {
+  registry->RegisterListPref(prefs::kDnsPrefetchingStartupList,
+                             PrefRegistrySyncable::UNSYNCABLE_PREF);
+  registry->RegisterListPref(prefs::kDnsPrefetchingHostReferralList,
+                             PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 // --------------------- Start UI methods. ------------------------------------