Move component updater artifacts into component_updater namespace.

chrome/browser/component_updater/pnacl/pnacl_profile_observer.h

Index: chrome/browser/component_updater/pnacl/pnacl_profile_observer.h
diff --git a/chrome/browser/component_updater/pnacl/pnacl_profile_observer.h b/chrome/browser/component_updater/pnacl/pnacl_profile_observer.h
index 18ef4e804360e63f9b9c19680974a521c7b9567f..2b377b67fd4eec2b65db98e66d756b4300e54fdf 100644
--- a/chrome/browser/component_updater/pnacl/pnacl_profile_observer.h
+++ b/chrome/browser/component_updater/pnacl/pnacl_profile_observer.h
@@ -9,6 +9,8 @@
 #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
@@ -29,4 +31,6 @@ class PnaclProfileObserver : public content::NotificationObserver {
   DISALLOW_COPY_AND_ASSIGN(PnaclProfileObserver);
 };
 
+}  // namespace component_updater
+
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_PNACL_PNACL_PROFILE_OBSERVER_H_