Have convertNPVariantToV8Object() use the isolate it is given

Source/bindings/v8/ScriptController.cpp

Index: Source/bindings/v8/ScriptController.cpp
diff --git a/Source/bindings/v8/ScriptController.cpp b/Source/bindings/v8/ScriptController.cpp
index f929daf07799895bab9558e1527783b0fe826291..db933b84f093573133af1412ac2c01af40e0b1cc 100644
--- a/Source/bindings/v8/ScriptController.cpp
+++ b/Source/bindings/v8/ScriptController.cpp
@@ -354,7 +354,7 @@ void ScriptController::bindToWindowObject(Frame* frame, const String& key, NPObj
 
     v8::Context::Scope scope(v8Context);
 
-    v8::Handle<v8::Object> value = createV8ObjectForNPObject(object, 0);
+    v8::Handle<v8::Object> value = createV8ObjectForNPObject(object, 0, m_isolate);
 
     // Attach to the global object.
     v8::Handle<v8::Object> global = v8Context->Global();
@@ -414,7 +414,7 @@ PassScriptInstance ScriptController::createScriptInstanceForWidget(Widget* widge
     // NPObject as part of its wrapper. However, before accessing the object
     // it must consult the _NPN_Registry.
 
-    v8::Local<v8::Object> wrapper = createV8ObjectForNPObject(npObject, 0);
+    v8::Local<v8::Object> wrapper = createV8ObjectForNPObject(npObject, 0, m_isolate);
 
     // Track the plugin object. We've been given a reference to the object.
     m_pluginObjects.set(widget, npObject);