[jdk11u-dev] RFR: 8268775: Password is being converted to String in AccessibleJPasswordField

[Martin Doerr]

Backport of JDK-8268775. Doesn't apply cleanly because cleanup JDK-8211300 is not in 11u. Taken new version which includes cleanup.

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Commit messages:
 - Backport 97e0e9e73d12c2b8e58ca2540d5153c10984731d

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/170/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=170&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268775
  Stats: 20 lines in 1 file changed: 4 ins; 7 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/170.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/170/head:pull/170

PR: https://git.openjdk.java.net/jdk11u-dev/pull/170