Remove most occurences of PrefRegistrySyncable::UNSYNCABLE_PREF

chrome/browser/accessibility/animation_policy_prefs.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/accessibility/animation_policy_prefs.h"
 
 #include "chrome/common/pref_names.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 
 const char kAnimationPolicyAllowed[] = "allowed";
 const char kAnimationPolicyOnce[] = "once";
 const char kAnimationPolicyNone[] = "none";
 
 void RegisterAnimationPolicyPrefs(user_prefs::PrefRegistrySyncable* registry) {
-  registry->RegisterStringPref(
-      prefs::kAnimationPolicy,
-      kAnimationPolicyAllowed,
-      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
+  registry->RegisterStringPref(prefs::kAnimationPolicy,
+                               kAnimationPolicyAllowed);
 }