[jdk8u-dev] RFR: 8074092: Newly introduced unnecessary dependencies on internal API in client regtests

[yaqsun]

Back up to openjdk8u.
Apply clean except for jdk/test/javax/swing/JButton/4796987/bug4796987.java, which no longer exists.

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Commit messages:
 - Backport 0803af98c7f332e4a8e10239fe00b7dcf58a90e2

Changes: https://git.openjdk.org/jdk8u-dev/pull/461/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=461&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8074092
  Stats: 28 lines in 7 files changed: 18 ins; 4 del; 6 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/461.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/461/head:pull/461

PR: https://git.openjdk.org/jdk8u-dev/pull/461