Move Singleton and related structs to namespace base

chrome/browser/chromeos/policy/user_cloud_policy_token_forwarder_factory.h

 // Copyright (c) 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_POLICY_USER_CLOUD_POLICY_TOKEN_FORWARDER_FACTORY_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_USER_CLOUD_POLICY_TOKEN_FORWARDER_FACTORY_H_
 
 #include "base/basictypes.h"
 #include "base/memory/singleton.h"
 #include "components/keyed_service/content/browser_context_keyed_service_factory.h"
 
 namespace content {
 class BrowserContext;
 }
 
 namespace policy {
 
 // Creates instances of UserCloudPolicyTokenForwarder for Profiles that may need
 // to fetch the policy token.
 class UserCloudPolicyTokenForwarderFactory
     : public BrowserContextKeyedServiceFactory {
  public:
   // Returns an instance of the UserCloudPolicyTokenForwarderFactory singleton.
   static UserCloudPolicyTokenForwarderFactory* GetInstance();
 
  private:
-  friend struct DefaultSingletonTraits<UserCloudPolicyTokenForwarderFactory>;
+  friend struct base::DefaultSingletonTraits<
+      UserCloudPolicyTokenForwarderFactory>;
 
   UserCloudPolicyTokenForwarderFactory();
   ~UserCloudPolicyTokenForwarderFactory() override;
 
   // BrowserContextKeyedServiceFactory:
   KeyedService* BuildServiceInstanceFor(
       content::BrowserContext* context) const override;
   bool ServiceIsCreatedWithBrowserContext() const override;
   bool ServiceIsNULLWhileTesting() const override;
 
   DISALLOW_COPY_AND_ASSIGN(UserCloudPolicyTokenForwarderFactory);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_USER_CLOUD_POLICY_TOKEN_FORWARDER_FACTORY_H_