`CompoundElement` already inherits `Iterable` and its `forEach(Consumer)`, thus we can remove `Iterable elements()` and `forEachElements(Consumer)`.
------------- Commit messages: - Missed tests - 8335905: CompoundElement API cleanup Changes: https://git.openjdk.org/jdk/pull/20103/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20103&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8335905 Stats: 83 lines in 32 files changed: 2 ins; 11 del; 70 mod Patch: https://git.openjdk.org/jdk/pull/20103.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/20103/head:pull/20103 PR: https://git.openjdk.org/jdk/pull/20103
