Intent to unship: XUL grid implementation

[Tim Nguyen]

Hi folks,

Thanks to Mats Palmgren & Rares Doghi, XUL grid got removed from tab prompts
<https://bugzilla.mozilla.org/show_bug.cgi?id=1583696>
(`alert`/`confirm`/`prompt`) last week, this was the last usage in
mozilla-central. If you notice any regressions, please file a bug and mark
it as a regression of bug 1583696
<https://bugzilla.mozilla.org/show_bug.cgi?id=1583696>.

All other XUL grid removals have baked for a year now.

With that being said, I'm planning to unship the XUL grid implementation in
Firefox 85 in bug 1525737
<https://bugzilla.mozilla.org/show_bug.cgi?id=1525737>, which includes:

- the whole layout/xul/grid directory
<https://searchfox.org/mozilla-central/source/layout/xul/grid>
- the -moz-grid/-moz-grid-group/-moz-grid-line CSS display values
- the <grid>/<row>/<column> XUL elements

If you need grid-like functionality, alternatives are CSS grid or HTML
tables.
Please let me know if you have any concerns or questions.

Cheers,
Tim

[Brian Grinstead]

This is wonderful - it helps the layout engine focus on web standard
implementations and gets rid of some quirky behavior in chrome UI. Thanks
for your persistence Tim.

Brian

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