Starting with the engine roll here #146483, which contains only the Dart roll here flutter/engine#51980, the super_editor customer tests started failing in presubmit like here https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8751160061603811569/+/u/run_test.dart_for_customer_testing_shard_and_subshard_None/stdout, with the error message:

| Resolving dependencies...
| Because super_editor depends on example_docs any which doesn't exist (could not find package example_docs at https://pub.dev/), version solving failed.
Processing ./../../bin/cache/pkg/tests/registry/super_editor.test...

I took a look through the repo at the pinned commit, and couldn't find any pubspec files that mentioned the example_docs package: https://github.com/superlistapp/super_editor/tree/bcba72823a3c21336960f0ac40a73d68d9034623.

cc @chinmaygarde incoming engine sheriff