SIGN IN SIGN UP

Reland migration (#69996)

This reverts ae0a9cb560ff3b334ab0cc23980374792888b2d1 and therefore relands #69629.

Additionally, `flutter update-packages --force-upgrade` has been run to update `pubspec.yaml` to resolve the analyze test failures.
Y
Yuqian Li committed
8e7748e74c1454edad6caa3e418db82a9f332680
Parent: cc52b32
Committed by GitHub <noreply@github.com> on 11/9/2020, 4:32:04 AM