5b14ee115a
_StringBase is used everywhere as if it was assignable to String, however it itself does not implement String, its subclasses do. This change addresses this. Also removes unused native runtime method from one of subclasses. Bug: https://github.com/dart-lang/sdk/issues/31052 Change-Id: Iea2389d1b48a3689fb11c99c0e230747ab1c5962 Reviewed-on: https://dart-review.googlesource.com/12444 Reviewed-by: Martin Kustermann <kustermann@google.com> Commit-Queue: Vyacheslav Egorov <vegorov@google.com>