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The <menu> tag is no longer supported as an interactive feature, but
is still supported as a semantic tag. The HTML spec still includes it
as a container for <li> children, but has removed <menuitem>.

Another option would be to try and be "clever" and look for
role=menuitem children, changing the mapping to menu. However, given
the state of the standard and varying browser support, it seems better
to not add extra complexity and also to not encourage usage.

Decisions:
- Support simple mapping to the list role, because if it's just used
semantically, it will be confusing for users who reach te menu and
it does not act like one.
- Remove behavior where child buttons/radios/checkboxes are mapped
to menuitemfoo roles when inside a menu. There is nothing spec'd in
HTML-AAM or CORE-AAM for either of these conditions, and it looks like
more strange menu code that was inherited from WebKit.

This CL will make it easier to support an upcoming CL that cleans
up radio button code.

Bug: None
Change-Id: I49e95b5e526e742102b0bb6ad92b17f7a4ba0175
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2543685Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828978}