The existing usage will no longer work as expected once the security
measures to prevent native Object prototype pollution are enabled.
The recommended replacements are `Object.getPrototypeOf()` and
`Object.setPrototypeOf()`.
Change-Id: I0617233bd31ccd2afc9f94c527eecb31c5f1b340
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/330047
Reviewed-by: Srujan Gaddam <srujzs@google.com>
Commit-Queue: Nicholas Shahan <nshahan@google.com>
Nicholas Shahan
c2a879e41d