RFR: 8344065: Remove SecurityManager uses from the java.datatransfer module

[Phil Race]

remove uses of SM APIs from the java.datatransfer module. Also cleans up the now un-needed export from java.base

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Commit messages:
 - 8344065

Changes: https://git.openjdk.org/jdk/pull/22127/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22127&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344065
  Stats: 32 lines in 3 files changed: 0 ins; 18 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/22127.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22127/head:pull/22127

PR: https://git.openjdk.org/jdk/pull/22127