<AWT Dev> RFR: 8271603: Unnecessary Vector usage in java.desktop

[Phil Race]

On Sun, 4 Jul 2021 20:42:41 GMT, Andrey Turbanov <github.com+741251+turbanoff at openjdk.org> wrote:

> Usage of thread-safe collection `Vector` is unnecessary. It's recommended to use `ArrayList` if a thread-safe implementation is not needed. In post-BiasedLocking times, this is gets worse, as every access is synchronized.
> I checked only places where `Vector` was used as local variable.

Changes requested by prr (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/4680