RFR: 8327492: Remove applet usage and update DisposeInActionEventTest.html [v10]

[Alisen Chung]

> Root cause of the test failure was fixed with https://bugs.openjdk.org/browse/JDK-8316931, updating this test since the other fix also included a test update.

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

  implemented changes from feedback

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17838/files
  - new: https://git.openjdk.org/jdk/pull/17838/files/4b9edb5d..9e053cae

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17838&range=09
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17838&range=08-09

  Stats: 27 lines in 2 files changed: 6 ins; 4 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/17838.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17838/head:pull/17838

PR: https://git.openjdk.org/jdk/pull/17838