Move Singleton and related structs to namespace base

chrome/browser/media/protected_media_identifier_permission_context_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/media/protected_media_identifier_permission_context_factory.h"
 
 #include "chrome/browser/media/protected_media_identifier_permission_context.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 
 // static
 ProtectedMediaIdentifierPermissionContext*
 ProtectedMediaIdentifierPermissionContextFactory::GetForProfile(
     Profile* profile) {
   return static_cast<ProtectedMediaIdentifierPermissionContext*>(
       GetInstance()->GetServiceForBrowserContext(profile, true));
 }
 
 // static
 ProtectedMediaIdentifierPermissionContextFactory*
 ProtectedMediaIdentifierPermissionContextFactory::GetInstance() {
-  return Singleton<
+  return base::Singleton<
       ProtectedMediaIdentifierPermissionContextFactory>::get();
 }
 
 ProtectedMediaIdentifierPermissionContextFactory::
 ProtectedMediaIdentifierPermissionContextFactory()
     : BrowserContextKeyedServiceFactory(
           "ProtectedMediaIdentifierPermissionContext",
           BrowserContextDependencyManager::GetInstance()) {
 }
 
@@ skipping 14 matching lines @@
 #if defined(OS_ANDROID)
   registry->RegisterBooleanPref(prefs::kProtectedMediaIdentifierEnabled, true);
 #endif
 }
 
 content::BrowserContext*
 ProtectedMediaIdentifierPermissionContextFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextOwnInstanceInIncognito(context);
 }