RFR: 8159451: [TEST_BUG] java/awt/Mixing/AWT_Mixing/JMenuBarOverlapping.java

[Alisen Chung]

Added more time to test, removed pixel check during EmbeddedFrame test from OverlappingTestBase.

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Commit messages:
 - removed from ProblemList
 - 8159451: [TEST_BUG] java/awt/Mixing/AWT_Mixing/JMenuBarOverlapping.java

Changes: https://git.openjdk.java.net/jdk/pull/6177/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6177&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8159451
  Stats: 6 lines in 3 files changed: 3 ins; 1 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6177.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6177/head:pull/6177

PR: https://git.openjdk.java.net/jdk/pull/6177