components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/ui/webui/print_preview/sticky_settings.h

Index: chrome/browser/ui/webui/print_preview/sticky_settings.h
diff --git a/chrome/browser/ui/webui/print_preview/sticky_settings.h b/chrome/browser/ui/webui/print_preview/sticky_settings.h
index 21c6ed42e121427d37e06a54b81090c3cdf81a53..4864d6c8f69ceaaa10932696cfb1fbafaf9592ea 100644
--- a/chrome/browser/ui/webui/print_preview/sticky_settings.h
+++ b/chrome/browser/ui/webui/print_preview/sticky_settings.h
@@ -13,13 +13,16 @@
 
 class PrintPreviewHandlerTest;
 class PrefService;
-class PrefRegistrySyncable;
 
 namespace base {
 class DictionaryValue;
 class FilePath;
 }
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 namespace printing {
 
 // Holds all the settings that should be remembered (sticky) in print preview.
@@ -40,7 +43,8 @@ class StickySettings {
 
   void SaveInPrefs(PrefService* profile);
   void RestoreFromPrefs(PrefService* profile);
-  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
+  static void RegisterUserPrefs(user_prefs::PrefRegistrySyncable* registry);
+
  private:
 
   scoped_ptr<base::FilePath> save_path_;