[jfx21u] Integrated: 8313711: Cherry-pick WebKit 616.1 stabilization fixes

[Hima Bindu Meda]

Clean backport

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Commit messages:
 - Backport af8950e7ebfa1f0705cc9ef5ab50ce25571c00d4

Changes: https://git.openjdk.org/jfx21u/pull/6/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx21u&pr=6&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313711
  Stats: 637 lines in 88 files changed: 320 ins; 150 del; 167 mod
  Patch: https://git.openjdk.org/jfx21u/pull/6.diff
  Fetch: git fetch https://git.openjdk.org/jfx21u.git pull/6/head:pull/6

PR: https://git.openjdk.org/jfx21u/pull/6