components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/printing/cloud_print/cloud_print_url.h

Index: chrome/browser/printing/cloud_print/cloud_print_url.h
diff --git a/chrome/browser/printing/cloud_print/cloud_print_url.h b/chrome/browser/printing/cloud_print/cloud_print_url.h
index 973223b7e261b85e4f21925c5089c6ca0755c88b..5c8573431cc3860f7d43323632161d98aa6d5c41 100644
--- a/chrome/browser/printing/cloud_print/cloud_print_url.h
+++ b/chrome/browser/printing/cloud_print/cloud_print_url.h
@@ -8,13 +8,16 @@
 #include <string>
 
 class GURL;
-class PrefRegistrySyncable;
 class Profile;
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 // Centralize URL management for the cloud print service.
 class CloudPrintURL {
  public:
-  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
+  static void RegisterUserPrefs(user_prefs::PrefRegistrySyncable* registry);
 
   explicit CloudPrintURL(Profile* profile) : profile_(profile) {}