RFR: 8328301: Convert Applet test ManualHTMLDataFlavorTest.java to main program [v2]

[Phil Race]

> Convert this applet based test to a main program

Phil Race has updated the pull request incrementally with one additional commit since the last revision:

  8328301

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18334/files
  - new: https://git.openjdk.org/jdk/pull/18334/files/86ec0268..38292f15

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18334&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18334&range=00-01

  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/18334.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18334/head:pull/18334

PR: https://git.openjdk.org/jdk/pull/18334