8281711: Cherry-pick WebKit 613.1 stabilization fixes

[johanvos]

Stabilization fixes from WebKitGTK 2.34.5

Reviewed-by: jvos, kcr

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Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Issue

• JDK-8281711: Cherry-pick WebKit 613.1 stabilization fixes ⚠️ Issue is not open.

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jfx pull/772/head:pull/772
$ git checkout pull/772

Update a local copy of the PR:
$ git checkout pull/772
$ git pull https://git.openjdk.java.net/jfx pull/772/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 772

View PR using the GUI difftool:
$ git pr show -t 772

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jfx/pull/772.diff

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Webrevs

• 00: Full (1e81bef5)