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Per UX request, we shouldn't show proactive suggestions during the same
login session if we've already shown them to the user. Duplicates are
defined as having the same content description.

Note that this has been implemented as a FeatureParam to give us a lever
to disable this behavior if needed.

Bug: b:139199754
Change-Id: I39e78529159ffd697383b98b23b4986f0d3a10ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1774968Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#691740}