initialize v8::Private with v8::String

include/v8.h

 // Copyright 2012 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 1915 matching lines @@
  * A private symbol
  *
  * This is an experimental feature. Use at your own risk.
  */
 class V8_EXPORT Private : public Data {
  public:
   // Returns the print name string of the private symbol, or undefined if none.
   Local<Value> Name() const;
 
   // Create a private symbol. If data is not NULL, it will be the print name.
-  static Local<Private> New(
-      Isolate *isolate, const char* data = NULL, int length = -1);
+  static Local<Private> New(Isolate *isolate,
+                            Local<String> name = Local<String>());
 
  private:
   Private();
 };
 
 
 /**
  * A JavaScript number value (ECMA-262, 4.3.20)
  */
 class V8_EXPORT Number : public Primitive {
@@ skipping 4507 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_