Integrated: 8259939: Remove JNF_COCOA_ENTER/EXIT usage from Lanai project

[Phil Race]

Remove JNF_COCOA_ENTER/EXIT

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Commit messages:
 - 8259939: Remove JNF_COCOA_ENTER/EXIT usage from Lanai project

Changes: https://git.openjdk.java.net/lanai/pull/154/files
 Webrev: https://webrevs.openjdk.java.net/?repo=lanai&pr=154&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259939
  Stats: 11 lines in 4 files changed: 0 ins; 0 del; 11 mod
  Patch: https://git.openjdk.java.net/lanai/pull/154.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/154/head:pull/154

PR: https://git.openjdk.java.net/lanai/pull/154