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: - 8299977: Update WebKit to 615.1 Changes: https://git.openjdk.org/jfx11u/pull/132/files Webrev: https://webrevs.openjdk.org/?repo=jfx11u&pr=132&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8299977 Stats: 197124 lines in 5579 files changed: 116283 ins; 42814 del; 38027 mod Patch: https://git.openjdk.org/jfx11u/pull/132.diff Fetch: git fetch https://git.openjdk.org/jfx11u pull/132/head:pull/132 PR: https://git.openjdk.org/jfx11u/pull/132
