RFR: 8344228: Revisit SecurityManager usage in java.net.http after JEP 486 integration [v3]

[Daniel Fuchs]

> Please find here a patch that cleans up the java.net.http module code to remove permission checks and doPriviliged calls.
> This was mostly mechanical.

Daniel Fuchs has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'master' into HttpClient-SM-8344228
 - Review feedback
 - 8344228: Revisit SecurityManager usage in java.net.http after JEP 486 integration

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22118/files
  - new: https://git.openjdk.org/jdk/pull/22118/files/61cfa49f..30d6f8dc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22118&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22118&range=01-02

  Stats: 1407 lines in 68 files changed: 523 ins; 689 del; 195 mod
  Patch: https://git.openjdk.org/jdk/pull/22118.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22118/head:pull/22118

PR: https://git.openjdk.org/jdk/pull/22118