RFR: 8301994: Remove unused code from awt_List.cpp

[Phil Race]

On Thu, 11 Jan 2024 18:43:00 GMT, Rajat Mahajan <rmahajan at openjdk.org> wrote:

> Remove commented out/ unused code from awt_List.cpp, which has been commented out since 2007, when the code was moved to Mercurial.
> The test ScrollPaneLimitation.java has been opened under [JDK-8306137](https://bugs.openjdk.org/browse/JDK-8306137), and it should be safe to remove this code now.

Marked as reviewed by prr (Reviewer).

-------------

PR Review: https://git.openjdk.org/jdk/pull/17378#pullrequestreview-1817008050