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These unit tests are the last examples of tests depending on
implementation details of SESSIONS sync, where overriding a feature
toggle was necessary.

Instead, let's embrace the new USS implementation.

Longer term, it may make sense to remove this dependency altogether and
migrate these unit tests to a test-specific OpenTabsUIDelegate. For
anything fancier, we should use proper sync integration tests. This
intermediate step makes it more obvious that there aren't behavioral
changes between the two sync implementations.

Bug: 895455
Change-Id: I1c3f26ec3037d71908cbf090644bf0580d8fd41b
Reviewed-on: https://chromium-review.googlesource.com/c/1301435
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608641}