Don't use Persistent in runtime

src/i18n.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 53 matching lines @@
       Handle<JSObject> options,
       Handle<JSObject> resolved);
 
   // Unpacks date format object from corresponding JavaScript object.
   static icu::SimpleDateFormat* UnpackDateFormat(Isolate* isolate,
                                                  Handle<JSObject> obj);
 
   // Release memory we allocated for the DateFormat once the JS object that
   // holds the pointer gets garbage collected.
   static void DeleteDateFormat(v8::Isolate* isolate,
-                               Persistent<v8::Object>* object,
+                               Persistent<v8::Value>* object,
                                void* param);
  private:
   DateFormat();
 };
 
 
 class NumberFormat {
  public:
   // Create a formatter for the specificied locale and options. Returns the
   // resolved settings for the locale / options.
   static icu::DecimalFormat* InitializeNumberFormat(
       Isolate* isolate,
       Handle<String> locale,
       Handle<JSObject> options,
       Handle<JSObject> resolved);
 
   // Unpacks number format object from corresponding JavaScript object.
   static icu::DecimalFormat* UnpackNumberFormat(Isolate* isolate,
                                                 Handle<JSObject> obj);
 
   // Release memory we allocated for the NumberFormat once the JS object that
   // holds the pointer gets garbage collected.
   static void DeleteNumberFormat(v8::Isolate* isolate,
-                                 Persistent<v8::Object>* object,
+                                 Persistent<v8::Value>* object,
                                  void* param);
  private:
   NumberFormat();
 };
 
 
 class Collator {
  public:
   // Create a collator for the specificied locale and options. Returns the
   // resolved settings for the locale / options.
   static icu::Collator* InitializeCollator(
       Isolate* isolate,
       Handle<String> locale,
       Handle<JSObject> options,
       Handle<JSObject> resolved);
 
   // Unpacks collator object from corresponding JavaScript object.
   static icu::Collator* UnpackCollator(Isolate* isolate, Handle<JSObject> obj);
 
   // Release memory we allocated for the Collator once the JS object that holds
   // the pointer gets garbage collected.
   static void DeleteCollator(v8::Isolate* isolate,
-                             Persistent<v8::Object>* object,
+                             Persistent<v8::Value>* object,
                              void* param);
  private:
   Collator();
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_I18N_H_