Limit the usage of SharedPersistent to ScriptValue only

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 0e672cf9ba68eb828bf17c9a2ebd0929eecc7625..271c72aef0dcda8092112d0865216ae502588624 100644
--- a/Source/bindings/v8/ScriptController.cpp
+++ b/Source/bindings/v8/ScriptController.cpp
@@ -345,16 +345,16 @@ void ScriptController::disableEval(const String& errorMessage)
     v8Context->SetErrorMessageForCodeGenerationFromStrings(v8String(m_isolate, errorMessage));
 }
 
-PassRefPtr<SharedPersistent<v8::Object> > ScriptController::createPluginWrapper(Widget* widget)
+ScriptValue ScriptController::createPluginWrapper(Widget* widget)
 {
     ASSERT(widget);
 
     if (!widget->isPluginView())
-        return 0;
+        return ScriptValue();
 
     NPObject* npObject = toPluginView(widget)->scriptableObject();
     if (!npObject)
-        return 0;
+        return ScriptValue();
 
     // Frame Memory Management for NPObjects
     // -------------------------------------
@@ -380,12 +380,12 @@ PassRefPtr<SharedPersistent<v8::Object> > ScriptController::createPluginWrapper(
     // 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, m_isolate);
+    v8::Handle<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);
 
-    return SharedPersistent<v8::Object>::create(wrapper, m_isolate);
+    return ScriptValue(wrapper, m_isolate);
 }
 
 void ScriptController::cleanupScriptObjectsForPlugin(Widget* nativeHandle)