RFR: JDK-8259238: Clean up Log.java and remove usage of non-final static variables.

[Andy Herrick]

JDK-8259238: Clean up Log.java and remove usage of non-final static variables.

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Commit messages:
 - JDK-8259238: Clean up Log.java and remove usage of non-final static variables.

Changes: https://git.openjdk.java.net/jdk/pull/1977/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1977&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259238
  Stats: 79 lines in 3 files changed: 12 ins; 49 del; 18 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1977.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1977/head:pull/1977

PR: https://git.openjdk.java.net/jdk/pull/1977