Don't use Persistent in runtime

src/i18n.h

Index: src/i18n.h
diff --git a/src/i18n.h b/src/i18n.h
index 5825ab6c6c783652fa8872bba47d93d4f5d5e8ae..e1eb745a10ec4c317fa842dd98c45e7bfc280d37 100644
--- a/src/i18n.h
+++ b/src/i18n.h
@@ -71,7 +71,7 @@ class DateFormat {
   // 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();
@@ -95,7 +95,7 @@ class NumberFormat {
   // 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();
@@ -118,7 +118,7 @@ class Collator {
   // 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();