components: Move PrefRegistrySyncable into user_prefs namespace.

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

Index: chrome/browser/ui/webui/ntp/most_visited_handler.h
diff --git a/chrome/browser/ui/webui/ntp/most_visited_handler.h b/chrome/browser/ui/webui/ntp/most_visited_handler.h
index 45d4e418536b7233aaef5e6e72c3d97baf051339..5bf6b9d04e53fd421136173f99a6d881244e6051 100644
--- a/chrome/browser/ui/webui/ntp/most_visited_handler.h
+++ b/chrome/browser/ui/webui/ntp/most_visited_handler.h
@@ -17,13 +17,16 @@
 
 class GURL;
 class PageUsageData;
-class PrefRegistrySyncable;
 
 namespace base {
 class ListValue;
 class Value;
 }
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 // The handler for Javascript messages related to the "most visited" view.
 //
 // This class manages one preference:
@@ -67,7 +70,7 @@ class MostVisitedHandler : public content::WebUIMessageHandler,
     return most_visited_urls_;
   }
 
-  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
+  static void RegisterUserPrefs(user_prefs::PrefRegistrySyncable* registry);
 
  private:
   struct MostVisitedPage;