RFR: JDK-8324337: Cherry-pick WebKit 617.1 stabilization fixes [v2]

[Hima Bindu Meda]

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

Hima Bindu Meda has updated the pull request incrementally with one additional commit since the last revision:

  Minor corrections as per review comments

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1350/files
  - new: https://git.openjdk.org/jfx/pull/1350/files/a5148855..7417b819

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1350&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1350&range=00-01

  Stats: 5 lines in 1 file changed: 3 ins; 1 del; 1 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