RFR: 8233557: [TESTBUG] DoubleClickTitleBarTest.java fails on macOs

[Alisen Chung]

test passed, removing from ProblemList.txt

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

Commit messages:
 - 8233557: [TESTBUG] DoubleClickTitleBarTest.java fails on macOs

Changes: https://git.openjdk.java.net/jdk/pull/6112/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6112&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8233557
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6112.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6112/head:pull/6112

PR: https://git.openjdk.java.net/jdk/pull/6112