RFR: JDK-8290975 Minor cleanup could be done in javax.security [v4]

[Mark Powers]

> https://bugs.openjdk.org/browse/JDK-8290975

Mark Powers has updated the pull request incrementally with one additional commit since the last revision:

  comment applies to two files

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9664/files
  - new: https://git.openjdk.org/jdk/pull/9664/files/2f54c822..21355258

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9664&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9664&range=02-03

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9664.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9664/head:pull/9664

PR: https://git.openjdk.org/jdk/pull/9664