Have Frame::script() return a reference

Source/bindings/v8/DOMWrapperWorld.cpp

Index: Source/bindings/v8/DOMWrapperWorld.cpp
diff --git a/Source/bindings/v8/DOMWrapperWorld.cpp b/Source/bindings/v8/DOMWrapperWorld.cpp
index 19b75c86df79928d88db7b9014eddeaa3f025c70..8d05871d935a64c24c75e9158a164d7183ebe28f 100644
--- a/Source/bindings/v8/DOMWrapperWorld.cpp
+++ b/Source/bindings/v8/DOMWrapperWorld.cpp
@@ -163,9 +163,9 @@ PassRefPtr<DOMWrapperWorld> DOMWrapperWorld::ensureIsolatedWorld(int worldId, in
     return world.release();
 }
 
-v8::Handle<v8::Context> DOMWrapperWorld::context(ScriptController* controller)
+v8::Handle<v8::Context> DOMWrapperWorld::context(ScriptController& controller)
 {
-    return controller->windowShell(this)->context();
+    return controller.windowShell(this)->context();
 }
 
 typedef HashMap<int, RefPtr<SecurityOrigin> > IsolatedWorldSecurityOriginMap;