[Mozilla Enterprise] Removal of non standard properties XMLDocument.load and XMLDocument.async

[Mike Kaply]

In Firefox 68, we removed support for the non standard, Firefox only
properties XMLDocument.load and XMLDocument.async via bug 332175
<https://bugzilla.mozilla.org/show_bug.cgi?id=332175>.

This caused some breakage so we decided to revert this change via a pref in bug
1569102 <https://bugzilla.mozilla.org/show_bug.cgi?id=1569102> in the
Firefox 68 ESR only so that folks could have an option if a website broke.

If you have dependencies on these non standard properties in your legacy
applications, please look into updating them.

For more information, See:

https://www.fxsitecompat.dev/en-CA/docs/2019/xmldocument-load-and-xmldocument-async-have-been-removed/

Mike Kaply
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