Clean backport. Tested in connection with 4 other WebKit fixes in the `test-kcr-11.0.19` branch, including a successful CI build. I also verfied that the native WebKit code is identical to mainline jfx after applying all patches (excluding a couple of copyright years).
------------- Commit messages: - 8301712: [linux] Crash on exit from WebKit 615.1 Changes: https://git.openjdk.org/jfx11u/pull/133/files Webrev: https://webrevs.openjdk.org/?repo=jfx11u&pr=133&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8301712 Stats: 7 lines in 1 file changed: 6 ins; 0 del; 1 mod Patch: https://git.openjdk.org/jfx11u/pull/133.diff Fetch: git fetch https://git.openjdk.org/jfx11u pull/133/head:pull/133 PR: https://git.openjdk.org/jfx11u/pull/133
