RFR: 8297132: BACKOUT JDK-8296889: Race condition when cancelling a request

[Daniel Fuchs]

This fix for [JDK-8296889](https://bugs.openjdk.org/browse/JDK-8296889) is causing trouble with the CancelStreamedBodyTest. Let's back it out until a better solution is found.

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Commit messages:
 - 8297132

Changes: https://git.openjdk.org/jdk/pull/11182/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11182&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297132
  Stats: 27 lines in 4 files changed: 2 ins; 21 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/11182.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11182/head:pull/11182

PR: https://git.openjdk.org/jdk/pull/11182