RFR: 8260163: IrresponsiveScriptTest.testInfiniteLoopInScript unit test fails on Windows [v2]

[Arun Joseph]

> Windows uses `WorkQueueGeneric` instead of `WorkQueueWin` from WebKit 610.2 onwards. In `WorkQueueWin`, `WorkQueue::dispatchAfter()` had a 20 ms `slopAdjustment` as the timer (called from `::SetTimer`) sometimes fire a few ms early. The same is not present in `WorkQueueGeneric` and needs to be added.
> 
> Also removing `WorkQueueWin` as it's removed for WebKit as well.

Arun Joseph has updated the pull request incrementally with one additional commit since the last revision:

  Update comment

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Changes:
  - all: https://git.openjdk.java.net/jfx/pull/391/files
  - new: https://git.openjdk.java.net/jfx/pull/391/files/739f3207..ea61414f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=391&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=391&range=00-01

  Stats: 10 lines in 1 file changed: 8 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jfx/pull/391.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/391/head:pull/391

PR: https://git.openjdk.java.net/jfx/pull/391