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Revert submission 279511 Reason for revert: Flutter dependencies are using nullable struct fields and need to be migrated first https://github.com/flutter/flutter/issues/120260 Reverted changes: /q/submissionid:279510 /q/submissionid:279511 Change-Id: I7ab66ef6c6b5f21303804b2930af4ad6aa000413 Tested: Revert Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/281600 Reviewed-by: Johnni Winther <johnniwinther@google.com>