tree bf06cfe6cf2a0a2bf69b760522225a745196df2b
parent f438d723873c66682002d2e96769482e0fff11aa
author Alexander Markov <alexmarkov@google.com> 1611605203 +0000
committer commit-bot@chromium.org <commit-bot@chromium.org> 1611605203 +0000

Migrate samples/sample_extension to null safety

Closes https://github.com/dart-lang/sdk/issues/43711

Change-Id: I7628e4a6192efb26a12f8051b4fa87dfafabab9c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/180960
Reviewed-by: Régis Crelier <regis@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>