<i18n dev> RFR: 8342903: Deprecate for removal java.awt.Window.getWarningString() [v4]

[Phil Race]

> This fix deprecates for removal java.awt.Window.getWarningString() and also javax.swing.JInternalFrame.getWarningString()
> l java.awt.Window.getWarningString() is only relevant with a SecurityManager and javax.swing.JInternalFrame.getWarningString() is just there for symmetry.
> 
> A few other spec changes ensue - the serial form variable warningString is removed is the main one.
> The AWTPermission showWindowWithoutWarningBanner is obsolete
> Reference to the system property  "awt.appletWarning" was actually already removed by JEP 486
> 
> There is a CSR for the spec. changes, which will need a reviewer : https://bugs.openjdk.org/browse/JDK-8344451
> 
> But the vast majority of the changes here are all the downstream obsoleted implementation
> The warning string and warning icon, and warning windows are all obsoleted.
> I think I tracked down all of it, but it is hard to be sure.
> Automated tests are passing, and I've manually tested SwingSet2 on all 3 platforms.

Phil Race has updated the pull request incrementally with one additional commit since the last revision:

  8342903

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/22221/files
  - new: https://git.openjdk.org/jdk/pull/22221/files/15b9eab4..5f840077

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22221&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22221&range=02-03

  Stats: 12 lines in 1 file changed: 0 ins; 12 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/22221.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22221/head:pull/22221

PR: https://git.openjdk.org/jdk/pull/22221