Move Singleton and related structs to namespace base

chrome/browser/policy/cloud/user_cloud_policy_invalidator_factory.cc

 // Copyright 2013 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/policy/cloud/user_cloud_policy_invalidator_factory.h"
 
 #include "chrome/browser/invalidation/profile_invalidation_provider_factory.h"
 #include "chrome/browser/policy/cloud/user_cloud_policy_invalidator.h"
 #include "chrome/browser/profiles/profile.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/policy/user_cloud_policy_manager_chromeos.h"
 #include "chrome/browser/chromeos/policy/user_cloud_policy_manager_factory_chromeos.h"
 #else
 #include "chrome/browser/policy/cloud/user_cloud_policy_manager_factory.h"
 #include "components/policy/core/common/cloud/user_cloud_policy_manager.h"
 #endif
 
 namespace policy {
 
 // static
 UserCloudPolicyInvalidatorFactory*
     UserCloudPolicyInvalidatorFactory::GetInstance() {
-  return Singleton<UserCloudPolicyInvalidatorFactory>::get();
+  return base::Singleton<UserCloudPolicyInvalidatorFactory>::get();
 }
 
 UserCloudPolicyInvalidatorFactory::UserCloudPolicyInvalidatorFactory()
     : BrowserContextKeyedServiceFactory(
           "UserCloudPolicyInvalidator",
           BrowserContextDependencyManager::GetInstance()) {
   DependsOn(invalidation::ProfileInvalidationProviderFactory::GetInstance());
 #if defined(OS_CHROMEOS)
   DependsOn(UserCloudPolicyManagerFactoryChromeOS::GetInstance());
 #else
@@ skipping 24 matching lines @@
   // Must be automatically created to enable user policy invalidations.
   return true;
 }
 
 bool UserCloudPolicyInvalidatorFactory::ServiceIsNULLWhileTesting() const {
   // Not used in tests.
   return true;
 }
 
 }  // namespace policy