b8c2cd49df
Compiled output for sound null safety mode no longer needs to check non-nullable arguments for null. They can't be null since we no longer allow mixed opt-in/out libraries when running with sound null safety. Cleanup a repeated string in the SDK. Change-Id: Ib7ae86f04660857957b4a7590bc5a7efd2c3fa04 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/154848 Reviewed-by: Mark Zhou <markzipan@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com> Commit-Queue: Nicholas Shahan <nshahan@google.com>