Disable ProfileKeyedServices on import process by default.

chrome/browser/extensions/extension_pref_value_map_factory.cc

 // Copyright (c) 2012 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_pref_value_map_factory.h"
 
 #include "chrome/browser/extensions/extension_pref_value_map.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_dependency_manager.h"
 
@@ skipping 11 matching lines @@
     Profile* profile) {
   return static_cast<ExtensionPrefValueMap*>(
       GetInstance()->GetServiceForProfile(profile, true));
 }
 
 // static
 ExtensionPrefValueMapFactory* ExtensionPrefValueMapFactory::GetInstance() {
   return Singleton<ExtensionPrefValueMapFactory>::get();
 }
 
+bool ExtensionPrefValueMapFactory::ServiceIsNULLOnImportProcess() const {
+  return false;
+}
+
 ProfileKeyedService* ExtensionPrefValueMapFactory::BuildServiceInstanceFor(
     Profile* profile) const {
   return new ExtensionPrefValueMap();
 }