Remove most occurences of PrefRegistrySyncable::UNSYNCABLE_PREF

chrome/browser/chromeos/policy/policy_cert_service_factory.cc

Index: chrome/browser/chromeos/policy/policy_cert_service_factory.cc
diff --git a/chrome/browser/chromeos/policy/policy_cert_service_factory.cc b/chrome/browser/chromeos/policy/policy_cert_service_factory.cc
index 4955bc020602f28583d3a15f81389f4d646d31ac..52a69f3a6da7e68aa98d9847bd83a6098103d99e 100644
--- a/chrome/browser/chromeos/policy/policy_cert_service_factory.cc
+++ b/chrome/browser/chromeos/policy/policy_cert_service_factory.cc
@@ -140,10 +140,7 @@ void PolicyCertServiceFactory::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   // TODO(joaodasilva): this is used for backwards compatibility.
   // Remove once it's not necessary anymore.
-  registry->RegisterBooleanPref(
-      prefs::kUsedPolicyCertificatesOnce,
-      false,
-      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
+  registry->RegisterBooleanPref(prefs::kUsedPolicyCertificatesOnce, false);
 }
 
 bool PolicyCertServiceFactory::ServiceIsNULLWhileTesting() const {