RFR: 8369510: JFR: Remove flush handler from Dispatcher lookup

[Erik Gahlin]

Could I get a review of a PR that removes dead code?

Testing: test/jdk/jdk/jfr

To ensure the code is not used, I added Thread.sleep(10000000) to the lambda, but no tests timed out.

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.org/jdk/pull/27733/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27733&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8369510
  Stats: 5 lines in 1 file changed: 0 ins; 5 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27733.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27733/head:pull/27733

PR: https://git.openjdk.org/jdk/pull/27733