Update to GTK WebKit 2.28.3 https://webkitgtk.org/2020/07/09/webkitgtk2.28.3-released.html
------------- Commit messages: - Cherry pick GTK WebKit 2.28.3 changes Changes: https://git.openjdk.java.net/jfx/pull/271/files Webrev: https://webrevs.openjdk.java.net/jfx/271/webrev.00 Issue: https://bugs.openjdk.java.net/browse/JDK-8249839 Stats: 533 lines in 36 files changed: 381 ins; 66 del; 86 mod Patch: https://git.openjdk.java.net/jfx/pull/271.diff Fetch: git fetch https://git.openjdk.java.net/jfx pull/271/head:pull/271 PR: https://git.openjdk.java.net/jfx/pull/271
