Cleanup: Constify some ProfileKeyedBaseFactory methods and all overrides. Remove ProfileKeyedBaseFa…

chrome/browser/sessions/tab_restore_service_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/sessions/tab_restore_service_factory.h"
 
 #include "chrome/browser/profiles/profile_dependency_manager.h"
 #include "chrome/browser/sessions/tab_restore_service.h"
 
 // static
@@ skipping 21 matching lines @@
 TabRestoreServiceFactory::~TabRestoreServiceFactory() {
 }
 
 ProfileKeyedService* TabRestoreServiceFactory::BuildServiceInstanceFor(
     Profile* profile) const {
   TabRestoreService* service = NULL;
   service = new TabRestoreService(profile);
   return service;
 }
 
-bool TabRestoreServiceFactory::ServiceIsNULLWhileTesting() {
+bool TabRestoreServiceFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }