Move Singleton and related structs to namespace base

chrome/browser/signin/signin_global_error_factory.cc

 // Copyright 2014 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/signin/signin_global_error_factory.h"
 
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/signin_error_controller_factory.h"
 #include "chrome/browser/signin/signin_global_error.h"
@@ skipping 17 matching lines @@
 
 // static
 SigninGlobalError* SigninGlobalErrorFactory::GetForProfile(
     Profile* profile) {
   return static_cast<SigninGlobalError*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
 SigninGlobalErrorFactory* SigninGlobalErrorFactory::GetInstance() {
-  return Singleton<SigninGlobalErrorFactory>::get();
+  return base::Singleton<SigninGlobalErrorFactory>::get();
 }
 
 KeyedService* SigninGlobalErrorFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
 #if defined(USE_ASH)
   if (ash::Shell::HasInstance())
     return NULL;
 #endif
 
   Profile* profile = static_cast<Profile*>(context);
 
   return new SigninGlobalError(
       SigninErrorControllerFactory::GetForProfile(profile), profile);
 }