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Ensures there is no dependency on modifying the native JavaScript Object prototype by preventing modifications when running browser tests. Change-Id: Ifb22018736f90b339b9c60bbab095fb3e1c483e1 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/320842 Reviewed-by: Sigmund Cherem <sigmund@google.com> Commit-Queue: Nicholas Shahan <nshahan@google.com>