Remove temporary hack re deleting hidden properties
Remove temporary hack re deleting hidden properties

BUG=

Review URL: https://codereview.chromium.org/1222223002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#29639}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh