drop unneeded changelog entry
drop unneeded changelog entry

Change-Id: I950e6650553ac3c6f3c1feafaf875bfcc0c9fc71
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/269145
Commit-Queue: Kallen Tu <b6f9eba4f92d9a364b1472e1f41eb410080a3b01@google.com>
Auto-Submit: Kevin Moore <1d6e7d10d051cf619c5282da3c28fd8d3e0a65a4@google.com>
Reviewed-by: Kallen Tu <b6f9eba4f92d9a364b1472e1f41eb410080a3b01@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