Move Singleton and related structs to namespace base

chrome/browser/spellchecker/spellcheck_factory.h

 // 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.
 
 #ifndef CHROME_BROWSER_SPELLCHECKER_SPELLCHECK_FACTORY_H_
 #define CHROME_BROWSER_SPELLCHECKER_SPELLCHECK_FACTORY_H_
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/singleton.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 
 class SpellcheckService;
 
 // Entry into the SpellCheck system.
 //
 // Internally, this owns all SpellcheckService objects.
 class SpellcheckServiceFactory : public BrowserContextKeyedServiceFactory {
  public:
   // Returns the spell check host. This will create the SpellcheckService
   // if it does not already exist. This can return NULL.
   static SpellcheckService* GetForContext(content::BrowserContext* context);
 
   static SpellcheckService* GetForRenderProcessId(int render_process_id);
 
   static SpellcheckServiceFactory* GetInstance();
 
  private:
-  friend struct DefaultSingletonTraits<SpellcheckServiceFactory>;
+  friend struct base::DefaultSingletonTraits<SpellcheckServiceFactory>;
 
   SpellcheckServiceFactory();
   ~SpellcheckServiceFactory() override;
 
   // BrowserContextKeyedServiceFactory:
   KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* context) const override;
   void RegisterProfilePrefs(
       user_prefs::PrefRegistrySyncable* registry) override;
   content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const override;
   bool ServiceIsNULLWhileTesting() const override;
 
   FRIEND_TEST_ALL_PREFIXES(SpellcheckServiceBrowserTest, DeleteCorruptedBDICT);
 
   DISALLOW_COPY_AND_ASSIGN(SpellcheckServiceFactory);
 };
 
 #endif  // CHROME_BROWSER_SPELLCHECKER_SPELLCHECK_FACTORY_H_