components: Move PrefRegistrySyncable into user_prefs namespace.

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

Index: chrome/browser/ui/webui/ntp/new_tab_page_handler.h
diff --git a/chrome/browser/ui/webui/ntp/new_tab_page_handler.h b/chrome/browser/ui/webui/ntp/new_tab_page_handler.h
index a2e8664653639778efeed26e8132bbf21a5ebc67..6a00f8b602c8fd6d9b7f62d286c4926a88b25abe 100644
--- a/chrome/browser/ui/webui/ntp/new_tab_page_handler.h
+++ b/chrome/browser/ui/webui/ntp/new_tab_page_handler.h
@@ -11,9 +11,12 @@
 #include "content/public/browser/web_ui_message_handler.h"
 
 class PrefRegistrySimple;
-class PrefRegistrySyncable;
 class Profile;
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 // Handler for general New Tab Page functionality that does not belong in a
 // more specialized handler.
 class NewTabPageHandler : public content::WebUIMessageHandler,
@@ -22,7 +25,7 @@ class NewTabPageHandler : public content::WebUIMessageHandler,
   NewTabPageHandler();
 
   // Register NTP per-profile preferences.
-  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
+  static void RegisterUserPrefs(user_prefs::PrefRegistrySyncable* registry);
 
   // Registers values (strings etc.) for the page.
   static void GetLocalizedValues(Profile* profile, DictionaryValue* values);