Replace early check for PNaCl with an on-demand check.

chrome/browser/component_updater/pnacl/pnacl_updater_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_
+#ifndef CHROME_BROWSER_COMPONENT_UPDATER_PNACL_PNACL_UPDATER_OBSERVER_H_
+#define CHROME_BROWSER_COMPONENT_UPDATER_PNACL_PNACL_UPDATER_OBSERVER_H_
 
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 class PnaclComponentInstaller;
 
-// Monitors profile switching for ChromeOS to check the per-user
-// version of PNaCl.
-class PnaclProfileObserver : public content::NotificationObserver {
+// Monitors the component updater service, so that the callbacks registered
+// against the PnaclComponentInstaller can be notified of events.
+class PnaclUpdaterObserver : public content::NotificationObserver {
  public:
-  explicit PnaclProfileObserver(PnaclComponentInstaller* installer);
-  virtual ~PnaclProfileObserver();
+  explicit PnaclUpdaterObserver(PnaclComponentInstaller* installer);
+  virtual ~PnaclUpdaterObserver();
 
   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);
+  DISALLOW_COPY_AND_ASSIGN(PnaclUpdaterObserver);
 };
 
-#endif  // CHROME_BROWSER_COMPONENT_UPDATER_PNACL_PNACL_PROFILE_OBSERVER_H_
+#endif  // CHROME_BROWSER_COMPONENT_UPDATER_PNACL_PNACL_UPDATER_OBSERVER_H_