components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/profiles/gaia_info_update_service_factory.h

Index: chrome/browser/profiles/gaia_info_update_service_factory.h
diff --git a/chrome/browser/profiles/gaia_info_update_service_factory.h b/chrome/browser/profiles/gaia_info_update_service_factory.h
index 0851814cf7c1cfb8a0d5628e9e591b1493fda525..129495a0b36bf50e556cb54c554df77de7c93904 100644
--- a/chrome/browser/profiles/gaia_info_update_service_factory.h
+++ b/chrome/browser/profiles/gaia_info_update_service_factory.h
@@ -9,9 +9,12 @@
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 
 class GAIAInfoUpdateService;
-class PrefRegistrySyncable;
 class Profile;
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 // Singleton that owns all GAIAInfoUpdateServices and associates them with
 // Profiles. Listens for the Profile's destruction notification and cleans up
 // the associated GAIAInfoUpdateService.
@@ -35,7 +38,8 @@ class GAIAInfoUpdateServiceFactory : public ProfileKeyedServiceFactory {
   virtual ProfileKeyedService* BuildServiceInstanceFor(
       content::BrowserContext* context) const OVERRIDE;
 
-  virtual void RegisterUserPrefs(PrefRegistrySyncable* registry) OVERRIDE;
+  virtual void RegisterUserPrefs(
+      user_prefs::PrefRegistrySyncable* registry) OVERRIDE;
   virtual bool ServiceIsNULLWhileTesting() const OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(GAIAInfoUpdateServiceFactory);