RFR: JDK-8324337: Cherry-pick WebKit 617.1 stabilization fixes

[Hima Bindu Meda]

Cherry-picked changes related to webkit-2.42.4.Verified build on all platforms. Sanity testing looks fine.

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Commit messages:
 - Resolve compilation error
 - Cherrypick changes related to 2.42.4

Changes: https://git.openjdk.org/jfx/pull/1350/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1350&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324337
  Stats: 1294 lines in 161 files changed: 750 ins; 111 del; 433 mod
  Patch: https://git.openjdk.org/jfx/pull/1350.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1350/head:pull/1350

PR: https://git.openjdk.org/jfx/pull/1350