RFR: 8328648: Remove applet usage from JFileChooser tests bug4150029 [v3]

[Alisen Chung]

> Removing applet usage from manual JFileChooser tests

Alisen Chung has updated the pull request incrementally with one additional commit since the last revision:

  change to automatic test

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18415/files
  - new: https://git.openjdk.org/jdk/pull/18415/files/630d78c9..0126af35

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18415&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18415&range=01-02

  Stats: 95 lines in 1 file changed: 53 ins; 19 del; 23 mod
  Patch: https://git.openjdk.org/jdk/pull/18415.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18415/head:pull/18415

PR: https://git.openjdk.org/jdk/pull/18415