Delete rows for removed feature

[jugglinmike]

In 2015, the "popup" value of the <menu> element's type attribute
was renamed to "context" [1]. In 2017, the <menuitem> element and the
type attribute of the <menu> element were removed entirely [2].

Remove the rows that describe these features.

[1] whatwg/html#241
[2] whatwg/html#2742

This patch seems incomplete to me because it does not introduce any mapping for the <menu> element. Although I would intuitively expect the mapping to be to WAI-ARIA "menu" across the board, it doesn't seem as though this was originally specified.

At the time the value "popup" was changed to "context" (see the first pull request listed above) the spec read:

The attribute may also be omitted. The missing value default is the "popup menu" state if the parent element is a menu element whose type attribute is in the "popup menu" state; otherwise, it is the "toolbar" state.

So as far as I can tell, since this table never defined a mapping for <menu="toolbar">, it likewise never defined a mapping for a "bare" <menu>.

This patch persists references to the menuitem role. I don't know if the change in HTML has any bearing on that role, but I thought this would be a sensible first step in any case.

The following tasks have been completed:

• Confirmed there are no ReSpec/BikeShed errors or warnings.
• Modified Web platform tests Remove tests for, and test the removal of, context menus web-platform-tests/wpt#6167 (couresy @domenic)

Implementation commitment:

• WebKit
• Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=732442)
• Gecko (https://bugzilla.mozilla.org/show_bug.cgi?id=1372276)

/cc @zcorpan

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[ylafon]

Marked as non substantive for IPR from ash-nazg.

[scottaohara]

hey there @jugglinmike, seems you've overlapped with work I had been doing in #214 to close #188.

Presently there are no browsers that do anything useful with mapping for a bare menu, but as it's an element defined in the HTML spec, we can't just remove it.

Currently in my PR I have menu set to map to role=list since the HTML specification notes that it should be considered like a ul. However bugs need to be filed with browsers and they need to commit to mapping the element as a list before I can pull in #214.

[scottaohara]

issue #188 was merged in closing #214.

closing this PR as duplicative.

[jugglinmike]

Hey @scottaohara! Clearly, I skipped an important part of FOSS development--searching the issue tracker. Glad to know someone's a step ahead on this :)

[scottaohara]

no worries, it was still appreciated. very happy to receive any other PRs for open issues though :D