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[Sync] Run password browser test exclusively for USS or non-USS clients

Before this Patch:
TwoClientPasswordsSyncTest were exercised against the 4 combinations
of USS and non-USS clients. This caused some tests to be flaky.
(check the linked bugs).

After this patch:
Since the plan is to roll out Sync USS Passwords for M77 (where all the
4 combinations have been tested already) we are now restricting the
testing to only USS or non-USS to remove the flakiness.

In case the rollout doesn't make it to M77, we should rethink about
reinstating the tests again.

Change-Id: I402f481723541a1a77314a8173a1144a1560cf77
Bug: 984944,980557,915219
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1768530Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690326}