Use LookupIterator in SetAccessor / DefineAccessor and remove "search_hidden_prototypes" from Looku…

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 953e58d03d44c1dc24facca8488eea4597970361..bbbfe59c40057aaeb60048ddb514fe22e2d6f6d9 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2010,8 +2010,7 @@ class JSReceiver: public HeapObject {
 
   // Lookup a property.  If found, the result is valid and has
   // detailed information.
-  void LookupOwn(Handle<Name> name, LookupResult* result,
-                 bool search_hidden_prototypes = false);
+  void LookupOwn(Handle<Name> name, LookupResult* result);
   void Lookup(Handle<Name> name, LookupResult* result);
 
   enum KeyCollectionType { OWN_ONLY, INCLUDE_PROTOS };