Have convertNPVariantToV8Object() use the isolate it is given

Source/bindings/v8/V8NPObject.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 36 matching lines @@
 void npObjectNamedPropertySetter(v8::Local<v8::String> name, v8::Local<v8::Value>, const v8::PropertyCallbackInfo<v8::Value>&);
 void npObjectIndexedPropertySetter(uint32_t index, const v8::PropertyCallbackInfo<v8::Value>&);
 void npObjectSetNamedProperty(v8::Local<v8::Object> self, v8::Local<v8::String> name, v8::Local<v8::Value>, const v8::PropertyCallbackInfo<v8::Value>&);
 void npObjectSetIndexedProperty(v8::Local<v8::Object> self, uint32_t index, v8::Local<v8::Value>, const v8::PropertyCallbackInfo<v8::Value>&);
 
 void npObjectInvokeDefaultHandler(const v8::FunctionCallbackInfo<v8::Value>&);
 
 // Get a wrapper for a NPObject.
 // If the object is already wrapped, the pre-existing wrapper will be returned. If the object is not wrapped, wrap it, and
 // give V8 a weak reference to the wrapper which will cleanup when there are no more JS references to the object.
-v8::Local<v8::Object> createV8ObjectForNPObject(NPObject*, NPObject* root);
+v8::Local<v8::Object> createV8ObjectForNPObject(NPObject*, NPObject* root, v8::Isolate*);
 
 // Tell V8 to forcibly remove an object.
 // This is used at plugin teardown so that the caller can aggressively unload the plugin library. After calling this
 // function, the persistent handle to the wrapper will be gone, and the wrapped NPObject will be removed so that it
 // cannot be referred to.
 void forgetV8ObjectForNPObject(NPObject*);
 
 } // namespace WebCore
 
 #endif // V8NPObject_h