RFR: 8281711: Cherry-pick WebKit 613.1 stabilization fixes [v2]

[Ambarish Rapte]

> Include additional stabilization fixes of WebKit 613.1
> Sanity testing did not show any concerns.

Ambarish Rapte has updated the pull request incrementally with one additional commit since the last revision:

  correct unintentional change

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

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/733/files
  - new: https://git.openjdk.java.net/jfx/pull/733/files/e58b3e38..a725f3dc

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=733&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=733&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jfx/pull/733.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/733/head:pull/733

PR: https://git.openjdk.java.net/jfx/pull/733