Converting use of `Collectors.toList()` to `Stream.toList()` where appropriate. Per [JDK-8260559](https://bugs.openjdk.java.net/browse/JDK-8260559).
------------- Commit messages: - Converting to Stream.toList() Changes: https://git.openjdk.java.net/jdk/pull/3629/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3629&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8263621 Stats: 13 lines in 9 files changed: 0 ins; 0 del; 13 mod Patch: https://git.openjdk.java.net/jdk/pull/3629.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/3629/head:pull/3629 PR: https://git.openjdk.java.net/jdk/pull/3629
