Remove most occurences of PrefRegistrySyncable::UNSYNCABLE_PREF

chrome/browser/extensions/extension_management.cc

 // Copyright 2014 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/extensions/extension_management.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 475 matching lines @@
       Profile::FromBrowserContext(context)->GetPrefs());
 }
 
 content::BrowserContext* ExtensionManagementFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }
 
 void ExtensionManagementFactory::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* user_prefs) {
-  user_prefs->RegisterDictionaryPref(
-      pref_names::kExtensionManagement,
-      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
+  user_prefs->RegisterDictionaryPref(pref_names::kExtensionManagement);
 }
 
 }  // namespace extensions