Move component updater artifacts into component_updater namespace.

chrome/browser/component_updater/pnacl/pnacl_profile_observer.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_COMPONENT_UPDATER_PNACL_PNACL_PROFILE_OBSERVER_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_PNACL_PNACL_PROFILE_OBSERVER_H_
 
 #include "base/compiler_specific.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
+namespace component_updater {
+
 class PnaclComponentInstaller;
 
 // Monitors profile switching for ChromeOS to check the per-user
 // version of PNaCl.
 class PnaclProfileObserver : public content::NotificationObserver {
  public:
   explicit PnaclProfileObserver(PnaclComponentInstaller* installer);
   virtual ~PnaclProfileObserver();
 
   virtual void Observe(
       int type,
       const content::NotificationSource& source,
       const content::NotificationDetails& details) OVERRIDE;
 
  private:
   content::NotificationRegistrar registrar_;
   PnaclComponentInstaller* pnacl_installer_;
   DISALLOW_COPY_AND_ASSIGN(PnaclProfileObserver);
 };
 
+}  // namespace component_updater
+
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_PNACL_PNACL_PROFILE_OBSERVER_H_