Allow setting accessor infos over read-only but configurable properties.
Allow setting accessor infos over read-only but configurable properties.

BUG=

Review URL: https://codereview.chromium.org/1228373004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#29655}

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