RFR: JDK-8291974 PrivateCredentialPermission should not use local variable to enable debugging [v4]

[Mark Powers]

> https://bugs.openjdk.org/browse/JDK-8291974

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

  Sean comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10206/files
  - new: https://git.openjdk.org/jdk/pull/10206/files/304134d7..b3698128

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10206&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10206&range=02-03

  Stats: 16 lines in 1 file changed: 3 ins; 6 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/10206.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10206/head:pull/10206

PR: https://git.openjdk.org/jdk/pull/10206