Move Singleton and related structs to namespace base

chrome/browser/ui/find_bar/find_bar_state_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_UI_FIND_BAR_FIND_BAR_STATE_FACTORY_H_
 #define CHROME_BROWSER_UI_FIND_BAR_FIND_BAR_STATE_FACTORY_H_
 
 #include "base/basictypes.h"
 #include "base/memory/singleton.h"
 #include "base/strings/string16.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 
 class Profile;
 class FindBarState;
 
 class FindBarStateFactory : public BrowserContextKeyedServiceFactory {
  public:
   static FindBarState* GetForProfile(Profile* profile);
 
   // Retrieves the last prepopulate text for a given Profile.  If the profile is
   // incognito and has an empty prepopulate text, falls back to the
   // prepopulate text from the normal profile.
   static base::string16 GetLastPrepopulateText(Profile* profile);
 
   static FindBarStateFactory* GetInstance();
 
  private:
-  friend struct DefaultSingletonTraits<FindBarStateFactory>;
+  friend struct base::DefaultSingletonTraits<FindBarStateFactory>;
 
   FindBarStateFactory();
   ~FindBarStateFactory() override;
 
   // BrowserContextKeyedServiceFactory:
   KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* profile) const override;
   content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const override;
 
   DISALLOW_COPY_AND_ASSIGN(FindBarStateFactory);
 };
 
 #endif  // CHROME_BROWSER_UI_FIND_BAR_FIND_BAR_STATE_FACTORY_H_