Remove AppContext from datatransfer classes. An obsoleted test is also removed.
------------- Commit messages: - 8378923 Changes: https://git.openjdk.org/jdk/pull/29991/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29991&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8378923 Stats: 154 lines in 5 files changed: 3 ins; 142 del; 9 mod Patch: https://git.openjdk.org/jdk/pull/29991.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/29991/head:pull/29991 PR: https://git.openjdk.org/jdk/pull/29991
