[jfx26u] RFR: 8375225: WebIObserverTest fails with WebKit 623.1

[Jay Bhaskar]

A clean backport for jfx26u. The fix is for WebIObserverTest  fails after webkit upgrade 623.1. The test fails without fix and passes with fix.

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

Commit messages:
 - Backport 055f827e470e8f28a0d408fb8550ae759e068984

Changes: https://git.openjdk.org/jfx26u/pull/4/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx26u&pr=4&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8375225
  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jfx26u/pull/4.diff
  Fetch: git fetch https://git.openjdk.org/jfx26u.git pull/4/head:pull/4

PR: https://git.openjdk.org/jfx26u/pull/4