Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/intranet_redirect_detector.cc

Index: chrome/browser/intranet_redirect_detector.cc
diff --git a/chrome/browser/intranet_redirect_detector.cc b/chrome/browser/intranet_redirect_detector.cc
index d7f9f639fd7241caada780fb12ea1ff5815d4fe6..a2ae736a0113126e4a51f708843262e6c6d28f59 100644
--- a/chrome/browser/intranet_redirect_detector.cc
+++ b/chrome/browser/intranet_redirect_detector.cc
@@ -55,7 +55,7 @@ GURL IntranetRedirectDetector::RedirectOrigin() {
 }
 
 // static
-void IntranetRedirectDetector::RegisterPrefs(PrefService* prefs) {
+void IntranetRedirectDetector::RegisterPrefs(PrefServiceSimple* prefs) {
   prefs->RegisterStringPref(prefs::kLastKnownIntranetRedirectOrigin,
                             std::string());
 }