Roll dart_style 2.0.0 into the SDK.
Roll dart_style 2.0.0 into the SDK.

No formatting changes, so no need to sync the pre-built SDK.

Change-Id: Ide5a58764e865e1226219ce6af9a5cb1444e29b8
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/191463
Auto-Submit: Bob Nystrom <afede3a9ebedb865bee78398feff6fbe97068f17@google.com>
Commit-Queue: Jake Macdonald <28dccc213a1e50b0de348b9cb82c0229ef6b65f0@google.com>
Reviewed-by: Jake Macdonald <28dccc213a1e50b0de348b9cb82c0229ef6b65f0@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