d1717197ec
This reverts commit c69f4321e6.
Reason for revert: `DartFixContributor` is used by Dart LSC tool, see b/318016861
Original change's description:
> analyzer: Remove unnecessary FixContributor and DartFixContributor classes
>
> I'm not sure what purpose they used to have or why they
> "are long-lived". But today they only serve as unnecessary object
> allocations.
>
> Change-Id: Icf73ddd42f540ae956dfeeb676de2f04bfca39d5
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/343240
> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
> Commit-Queue: Samuel Rawlins <srawlins@google.com>
Change-Id: Ic71e337399e263b899b0ffcbe388986d6011f6f9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/344000
Reviewed-by: Alexander Thomas <athom@google.com>
Commit-Queue: Ilya Yanok <yanok@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>