Move component updater artifacts into component_updater namespace.

chrome/browser/component_updater/recovery_component_installer.h

 // Copyright (c) 2011 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_COMPONENT_UPDATER_RECOVERY_COMPONENT_INSTALLER_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_RECOVERY_COMPONENT_INSTALLER_H_
 
-class ComponentUpdateService;
 class PrefRegistrySimple;
 class PrefService;
 
+namespace component_updater {
+
+class ComponentUpdateService;
+
 // Component update registration for the recovery component. The job of the
 // recovery component is to repair the chrome installation or repair the Google
 // update installation. This is a last resort safety mechanism.
 void RegisterRecoveryComponent(ComponentUpdateService* cus,
                                PrefService* prefs);
 
 
 // Register user preferences related to the recovery component.
 void RegisterPrefsForRecoveryComponent(PrefRegistrySimple* registry);
 
+}  // namespace component_updater
+
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_RECOVERY_COMPONENT_INSTALLER_H_