Move Singleton and related structs to namespace base

chrome/browser/ui/find_bar/find_bar_state_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/ui/find_bar/find_bar_state_factory.h"
 
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/find_bar/find_bar_state.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
@@ skipping 13 matching lines @@
     // Fall back to the original profile.
     state = GetForProfile(p->GetOriginalProfile());
     text = state->last_prepopulate_text();
   }
 
   return text;
 }
 
 // static
 FindBarStateFactory* FindBarStateFactory::GetInstance() {
-  return Singleton<FindBarStateFactory>::get();
+  return base::Singleton<FindBarStateFactory>::get();
 }
 
 FindBarStateFactory::FindBarStateFactory()
     : BrowserContextKeyedServiceFactory(
         "FindBarState",
         BrowserContextDependencyManager::GetInstance()) {
 }
 
 FindBarStateFactory::~FindBarStateFactory() {}
 
 KeyedService* FindBarStateFactory::BuildServiceInstanceFor(
     content::BrowserContext* profile) const {
   return new FindBarState;
 }
 
 content::BrowserContext* FindBarStateFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextOwnInstanceInIncognito(context);
 }