Use the LookupIterator for SetElement and friends

src/liveedit.cc

Index: src/liveedit.cc
diff --git a/src/liveedit.cc b/src/liveedit.cc
index fa291fefbdeaa49febef68e14caac639badf87dd..982ac109be1867758a3b19e30a6e543f261615d7 100644
--- a/src/liveedit.cc
+++ b/src/liveedit.cc
@@ -28,7 +28,7 @@ void SetElementSloppy(Handle<JSObject> object,
   // Ignore return value from SetElement. It can only be a failure if there
   // are element setters causing exceptions and the debugger context has none
   // of these.
-  JSObject::SetElement(object, index, value, NONE, SLOPPY).Assert();
+  JSObject::SetElement(object, index, value, SLOPPY).Assert();
 }