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When using pinned tabs, the banner will immediately disappear because
of the navigation to the pinned tab's address. This ensures that there
is a minimum display period before the banner expires on navigations.

Bug: 1001333
Change-Id: Idabc5a972696068f3ce7d5a9f70ee0ca95d4c0f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1925063
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720922}