RFR: 8261168: Convert javadoc tool to use Stream.toList()

[Ian Graves]

8261168: Convert javadoc tool to use Stream.toList()

-------------

Commit messages:
 - Updating to Stream.toLlist() from Collectors.toList()

Changes: https://git.openjdk.java.net/jdk/pull/3612/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3612&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261168
  Stats: 48 lines in 9 files changed: 7 ins; 8 del; 33 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3612.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3612/head:pull/3612

PR: https://git.openjdk.java.net/jdk/pull/3612