Revert of Replace SetObjectProperty / DefineObjectProperty with less powerful alternatives where relevant.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 501eef4c20086a1d2361542b0117d0eb1a868340..27528d644253793d8418fc019ec183557cd52c31 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -1194,20 +1194,6 @@
                                         const char* name) {
   Handle<String> str = isolate->factory()->InternalizeUtf8String(name);
   return GetProperty(object, str);
-}
-
-
-MaybeHandle<Object> JSObject::DefinePropertyOrElement(
-    Handle<JSObject> object, Handle<Name> name, Handle<Object> value,
-    PropertyAttributes attributes) {
-  uint32_t index;
-  if (name->AsArrayIndex(&index)) {
-    return SetOwnElementIgnoreAttributes(object, index, value, attributes);
-  }
-
-  // TODO(verwaest): Is this necessary?
-  if (name->IsString()) name = String::Flatten(Handle<String>::cast(name));
-  return SetOwnPropertyIgnoreAttributes(object, name, value, attributes);
 }