RFR: 8342459: Remove calls to doPrivileged in javafx.base [v2]

[Ambarish Rapte]

> Remove `doPrivileged` calls in the javafx.base module.
> The changes are straight forward.
> 1. Remove doPrivileged calls, with keeping the lambda expression.
> 2. Remove SuppressWarnings annotations
> 3. Remove unused imports

Ambarish Rapte 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:

 - review: rm unused acc
 - Merge branch 'master' into rm-doPrivi
 - rm doPrivileged in javafx.base

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1625/files
  - new: https://git.openjdk.org/jfx/pull/1625/files/2405da91..70ebdf94

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1625&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1625&range=00-01

  Stats: 213 lines in 18 files changed: 18 ins; 152 del; 43 mod
  Patch: https://git.openjdk.org/jfx/pull/1625.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1625/head:pull/1625

PR: https://git.openjdk.org/jfx/pull/1625