RFR: 8280970: Cleanup dead code in java.security.Provider

[Valerie Peng]

On Thu, 20 Jan 2022 18:25:48 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> Method `Provider.getKey` was added in [JDK-8276660](https://bugs.openjdk.java.net/browse/JDK-8276660). It was unused since introduction.
> Method `EngineDescription.getConstructorParameterClass()` and field `EngineDescription.constructorParameterClass` is unused since [JDK-7191662](https://bugs.openjdk.java.net/browse/JDK-7191662)

Looks good. Thanks for the clean up.

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

Marked as reviewed by valeriep (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/7164