Remove AppContext from java.awt.Container. I didn't find any test failures due to this removal
I also included here a couple of removals of obsolete comments. --------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - 8384206 Changes: https://git.openjdk.org/jdk/pull/31099/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=31099&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8384206 Stats: 63 lines in 3 files changed: 8 ins; 43 del; 12 mod Patch: https://git.openjdk.org/jdk/pull/31099.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/31099/head:pull/31099 PR: https://git.openjdk.org/jdk/pull/31099
