Mark URL constructor support in Safari as partial (#6752)
Mark URL constructor support in Safari as partial (#6752)

This change marks the URL constructor with partial_implementation:true for
Safari, due to Safari throwing for new URL('http://x', undefined) — that is,
if the URL constructor is called with base URL whose value is undefined.

Relates to https://github.com/mdn/browser-compat-data/issues/6749
Relates to https://bugs.webkit.org/show_bug.cgi?id=216841
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data