RFR: 8292850: Unused field 'expiredTimersKey' in javax.swing.TimerQueue

[Andrey Turbanov]

8292850: Unused field 'expiredTimersKey' in javax.swing.TimerQueue

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Commit messages:
 - 8292850: Unused field 'expiredTimersKey' in javax.swing.TimerQueue

Changes: https://git.openjdk.org/jdk/pull/10001/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10001&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292850
  Stats: 9 lines in 1 file changed: 0 ins; 7 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/10001.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10001/head:pull/10001

PR: https://git.openjdk.org/jdk/pull/10001