RFR: 8344060: Remove doPrivileged calls from shared implementation code in the java.desktop module : part 1 [v3]

[Prasanta Sadhukhan]

> Since JEP 486 : Permanently Disable the Security Manager
> [https://bugs.openjdk.org/browse/JDK-8338625] is now integrated, calls to java.security.AccessController.doPrivileged are obsolete and can be removed.
> 
> This PR takes care of some of the shared-platform files in the java.desktop module to have them removed.

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  Remove suppresswarnings

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/22133/files
  - new: https://git.openjdk.org/jdk/pull/22133/files/be586922..3ac8b1e8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22133&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22133&range=01-02

  Stats: 21 lines in 7 files changed: 5 ins; 12 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/22133.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22133/head:pull/22133

PR: https://git.openjdk.org/jdk/pull/22133