Have convertNPVariantToV8Object() use the isolate it is given

Source/bindings/v8/V8NPObject.cpp

Index: Source/bindings/v8/V8NPObject.cpp
diff --git a/Source/bindings/v8/V8NPObject.cpp b/Source/bindings/v8/V8NPObject.cpp
index e5aaf6e480f6d582aa50523dd5fa38d89180ee58..137e12509943463eb607a45e056bddfd554206cc 100644
--- a/Source/bindings/v8/V8NPObject.cpp
+++ b/Source/bindings/v8/V8NPObject.cpp
@@ -415,14 +415,12 @@ inline void DOMWrapperMap<NPObject>::makeWeakCallback(v8::Isolate* isolate, v8::
         _NPN_ReleaseObject(npObject);
 }
 
-v8::Local<v8::Object> createV8ObjectForNPObject(NPObject* object, NPObject* root)
+v8::Local<v8::Object> createV8ObjectForNPObject(NPObject* object, NPObject* root, v8::Isolate* isolate)
 {
     static v8::Eternal<v8::FunctionTemplate> npObjectDesc;
 
     ASSERT(v8::Context::InContext());
 
-    v8::Isolate* isolate = v8::Isolate::GetCurrent();
-
     // If this is a v8 object, just return it.
     V8NPObject* v8NPObject = npObjectToV8NPObject(object);
     if (v8NPObject)