[infra] Bump chrome to 81.0.4044.138
[infra] Bump chrome to 81.0.4044.138

Change-Id: I3a1a4bc97f077871d28e5c7d39a5a8f9e784de6e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/148533
Reviewed-by: Karl Klose <49bc0b76cffb0b10cd8c84f9cabc97a31ffe6343@google.com>
Commit-Queue: Alexander Thomas <29642742b6693024c89de8232f2e2542cf7eedf7@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk