RFR: 8344228: Revisit SecurityManager usage in java.net.http after JEP 486 integration [v4]

[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 incrementally with one additional commit since the last revision:

  Jaikiran's feedback

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22118/files
  - new: https://git.openjdk.org/jdk/pull/22118/files/30d6f8dc..b128391f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22118&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22118&range=02-03

  Stats: 20 lines in 3 files changed: 1 ins; 17 del; 2 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