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Instead of mapping the ARIA combobox role to other roles on MacOS,
always use it unless it is applied to a multiline edit field. This
matches the specified behavior and other browsers.

These were originally mapped to other roles because of VoiceOver
failures that have been fixed with other changes.

Bug: 1125165
Change-Id: I26b8ccb006c15d6329da1c29193640f529fab781
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611093Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Martin Robinson <mrobinson@igalia.com>
Cr-Commit-Position: refs/heads/master@{#844021}