components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/ui/webui/ntp/new_tab_ui.h

Index: chrome/browser/ui/webui/ntp/new_tab_ui.h
diff --git a/chrome/browser/ui/webui/ntp/new_tab_ui.h b/chrome/browser/ui/webui/ntp/new_tab_ui.h
index 86055acbef931861143cbe7a37e881e78df7e664..644430a567aa8099ffcbb6045ec66cdd6af77a45 100644
--- a/chrome/browser/ui/webui/ntp/new_tab_ui.h
+++ b/chrome/browser/ui/webui/ntp/new_tab_ui.h
@@ -17,13 +17,16 @@
 #include "content/public/browser/web_ui_controller.h"
 
 class GURL;
-class PrefRegistrySyncable;
 class Profile;
 
 namespace base {
 class DictionaryValue;
 }
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 // The WebUIController used for the New Tab page.
 class NewTabUI : public content::WebUIController,
                  public content::NotificationObserver {
@@ -31,7 +34,7 @@ class NewTabUI : public content::WebUIController,
   explicit NewTabUI(content::WebUI* web_ui);
   virtual ~NewTabUI();
 
-  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
+  static void RegisterUserPrefs(user_prefs::PrefRegistrySyncable* registry);
 
   // Returns whether or not to show apps pages.
   static bool ShouldShowApps();