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maxlength-number.html sends multiple keys in one call. Iterate across
the keys string to send more than one character.

Move another test that uses the actions API to the unsupported section.

Change-Id: Ic0eb9467e171933deaf6b389bd0cf701ce24f0fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132679Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755574}