RFR: 8359053: Implement JEP 504 - Remove the Applet API [v9]

[Phil Race]

On Tue, 17 Jun 2025 03:33:05 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

> > I am inclined to ask the networking API owners what the purpose and future should be.
> 
> Yeah, that will be useful to know the future of this api, we have similar handlers for images.

Discussion here  https://mail.openjdk.org/pipermail/net-dev/2025-June/027254.html

The suggestion was to return null. That might be a long-term direction but for now I'm going with the idea to return SoundClip. It is a little more usable for migration than null.

We might some day get rid of the MultimediaContentHandlers but not here/yet
FYI:  my testing, there's nothing that relies on the audio handlers *except* for tests explicitly for these.
The image case is however used in the java.beans implementation
I submitted  https://bugs.openjdk.org/browse/JDK-8359727

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PR Review Comment: https://git.openjdk.org/jdk/pull/25698#discussion_r2153010836