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The test checks that the links that suppose to open a new tab work as
expected in the reauth dialog.

Bug: 1045515
Change-Id: I4abddb7506b0bae209c6865d59cc8b3be4526ded
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2226754
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775073}