Form-associated custom elements: customElements.define() should check existence of 'value' property setter on a prototype chain

This is a follow-up of crrev.com/613499.

Bug: 905922
Bug: https://github.com/w3c/webcomponents/issues/187
Change-Id: I0c364d1f3031dde063d40867b5b93cde8a4bdc0e
Reviewed-on: https://chromium-review.googlesource.com/c/1370240
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615497}
2 files changed