RFR: 6798061: The removal of System.out.println from KeyboardManager

[Prasanta Sadhukhan]

Internal debugging code is removed.

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Commit messages:
 - 6798061: The removal of System.out.println from KeyboardManager

Changes: https://git.openjdk.org/jdk/pull/25851/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25851&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-6798061
  Stats: 13 lines in 1 file changed: 0 ins; 12 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25851.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25851/head:pull/25851

PR: https://git.openjdk.org/jdk/pull/25851