Source code cleanup. Add @since, remove unused imports and remove unnecessary SuppressWarnings of deprecation.
------------- Commit messages: - 8310999: Add @since info in jdk.jsobject files Changes: https://git.openjdk.org/jdk/pull/14775/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14775&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8310999 Stats: 9 lines in 2 files changed: 1 ins; 5 del; 3 mod Patch: https://git.openjdk.org/jdk/pull/14775.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/14775/head:pull/14775 PR: https://git.openjdk.org/jdk/pull/14775
