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After a full launch of UssWalletData on Stable, this CL simplifies
parametrization for sync_intgration tests. From now on, we only switch
between Directory and USS implementation of WalletMetadata.

Bug: 853688
Change-Id: I500bbb66b5aed65d27ea9e4955bbfb4e31023630
Reviewed-on: https://chromium-review.googlesource.com/c/1489194
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Auto-Submit: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635926}