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There are two such entry points and only one should be shown at a
given time, based on whether signinAllowed is true/false. Incorrectly,
both of them were showing when signinAllowed=false.

Existing tests were failing to catch the problem, and erroneously
succeeded. Fixing tests as well.

Fixed: 1063451
Change-Id: Ic0b6046b2f6e5934a76133ca95a702f9bc79bd46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2112899
Commit-Queue: dpapad <dpapad@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752563}