RFR: 8327969: Convert javax/swing/border/Test6910490.java applet test to main

[Tejesh R]

Convert javax/swing/border/Test6910490.java applet test to main based test using PassFailJFrame.

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

Commit messages:
 - Conversion from Applet to Main

Changes: https://git.openjdk.org/jdk/pull/18229/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18229&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327969
  Stats: 61 lines in 2 files changed: 20 ins; 34 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/18229.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18229/head:pull/18229

PR: https://git.openjdk.org/jdk/pull/18229