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The img tag for the regulatory info contains role="presentation" which
makes the screen reader skip the alt tag. This tag was originally added
because the a11y tests were failing
(https://chromium-review.googlesource.com/c/chromium/src/+/1345127).

The original issue of test failures was actually because regulatory
info is asynchronously filled in, so when the page is loaded,
regulatoryInfo_.text which is used as the alt tag is empty. This makes
the a11y tests fail since it expects a non empty string as the value.

This change fixes the tests by setting the regulatory info text through
the fake browser proxy, and removes the role="presentation" tag since
it's not needed anymore to make the tests pass.

BUG=950842

Change-Id: I136456fab06c15b9d13f0d7827f251062d242c25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1653085Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: May Lippert <maybelle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#668468}