webkit-gtk: Update wip/webkit-gtk to 2.16.3
Changes:
WebKitGTK+ 2.16.3
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- Fix URL shown in the title of beforeunload dialogs.
- Focus first input field of HTTP authentication dialog.
- Fix rendering glitches in HiDPI in long GitHub Gist pages when focusing the comments textarea.
- Remove Firefox user agent quirk for Google domains.
- Remove LATEST_RECORD_VERSION from GnuTLS priority string.
- Fix several crashes and rendering issues.
- Security fixes: CVE-2017-2496, CVE-2017-2539, CVE-2017-2510.
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