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Delete syncer commit ordering tests

Commit ordering requirements across entities are relevant for bookmarks
only, and no longer implemented within the sync engine. The tests
deleted in this patch exercised the legacy Sync Directory, to be deleted
soon. Equivalent tests, with modern requirements in mind, already exist
in SyncedBookmarkTrackerTest.

Change-Id: I4abf6c5231d545d0bd34d397b0855563821bea18
Bug: 923287
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2257237
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781222}