Field `keyListener` was added under [JDK-8033699](https://bugs.openjdk.org/browse/JDK-8033699). But then all its usages were removed in [JDK-8249548](https://bugs.openjdk.org/browse/JDK-8249548)
------------- Commit messages: - [PATCH] Unused field 'keyListener' in BasicRadioButtonUI Changes: https://git.openjdk.org/jdk/pull/9832/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9832&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8292280 Stats: 10 lines in 1 file changed: 0 ins; 9 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/9832.diff Fetch: git fetch https://git.openjdk.org/jdk pull/9832/head:pull/9832 PR: https://git.openjdk.org/jdk/pull/9832
