Reduce usage of v8::Isolate::GetCurrent() in NPV8Object

Source/bindings/v8/NPV8Object.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Google Inc. 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
@@ skipping 46 matching lines @@
 };
 
 struct PrivateIdentifier {
     union {
         const NPUTF8* string;
         int32_t number;
     } value;
     bool isString;
 };
 
-NPObject* npCreateV8ScriptObject(NPP, v8::Handle<v8::Object>, DOMWindow*);
+NPObject* npCreateV8ScriptObject(NPP, v8::Handle<v8::Object>, DOMWindow*, v8::Isolate*);
 
 NPObject* v8ObjectToNPObject(v8::Handle<v8::Object>);
 
 V8NPObject* npObjectToV8NPObject(NPObject*);
 
-void disposeUnderlyingV8Object(NPObject*);
+void disposeUnderlyingV8Object(NPObject*, v8::Isolate*);
 
 } // namespace WebCore
 
 #endif // NPV8Object_h