RFR: 8344252: SM cleanup in java.util classes [v2]

[Roger Riggs]

> Remove use of doPrivileged and SecurityManager in java.util.

Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:

  Applied suggestions from review comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22122/files
  - new: https://git.openjdk.org/jdk/pull/22122/files/9021ee53..f8e518f7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22122&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22122&range=00-01

  Stats: 3 lines in 3 files changed: 0 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/22122.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22122/head:pull/22122

PR: https://git.openjdk.org/jdk/pull/22122