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<!-- start_original_pr_link --> Reverts: flutter/flutter#166114 <!-- end_original_pr_link --> <!-- start_initiating_author --> Initiated by: gmackall <!-- end_initiating_author --> <!-- start_revert_reason --> Reason for reverting: a failing postsubmit <!-- end_revert_reason --> <!-- start_original_pr_author --> Original PR Author: gmackall <!-- end_original_pr_author --> <!-- start_reviewers --> Reviewed By: {bartekpacia, reidbaker} <!-- end_reviewers --> <!-- start_revert_body --> This change reverts the following previous change: Finishes the conversion of the Flutter Gradle plugin from Groovy to Kotlin. Fixes https://github.com/flutter/flutter/issues/121541. Fixes https://github.com/flutter/flutter/issues/166287. ## Pre-launch Checklist - [x] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [x] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [x] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [x] I signed the [CLA]. - [x] I listed at least one issue that this PR fixes in the description above. - [x] I updated/added relevant documentation (doc comments with `///`). - [x] I added new tests to check the change I am making, or this PR is [test-exempt]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md <!-- end_revert_body --> Co-authored-by: auto-submit[bot] <flutter-engprod-team@google.com>