https://github.com/flutter/flutter/blob/master/docs/contributing/Style-guide-for-Flutter-repo.md#code-that-is-not-copyrighted-the-flutter-authors

With the monorepo merge some of this is no longer up-to-date (e.g. we now have a third_party folder within the engine folder, that's not at the root of the repo).

This should be updated to match the current code organization of the repo.