[jdk17u-dev] RFR: 8317808: HTTP/2 stream cancelImpl may leave subscriber registered [v3]

[Goetz Lindenmaier]

> I backport this for parity with 17.0.17-oracle.

Goetz Lindenmaier has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  backport 6273ab97dc1a0d3c1f51ba94694d9594dd7593d4

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Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/3719/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/3719/files/4a85d8f1..eafa0268

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3719&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3719&range=01-02

  Stats: 7 lines in 1 file changed: 7 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3719.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3719/head:pull/3719

PR: https://git.openjdk.org/jdk17u-dev/pull/3719