Clean backport of the fix for 8311097 from openjfx/master to jfx21u. Local runs of :web:test reveal no issues.
------------- Commit messages: - 8311097: Synchron XMLHttpRequest not receiving data Changes: https://git.openjdk.org/jfx21u/pull/12/files Webrev: https://webrevs.openjdk.org/?repo=jfx21u&pr=12&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8311097 Stats: 52 lines in 4 files changed: 50 ins; 1 del; 1 mod Patch: https://git.openjdk.org/jfx21u/pull/12.diff Fetch: git fetch https://git.openjdk.org/jfx21u.git pull/12/head:pull/12 PR: https://git.openjdk.org/jfx21u/pull/12
