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The test PersistProgressMarkerOnRestart used to fail for USS Bookmarks
because the metadata weren't persisted properly.

This CL makes sure that the processor would outlive the bookmark model
such that the metadata is available at the time when the model is
getting destructed and persisted on disk.

Bug: 816866
Change-Id: Ief259bd75ee66a6f9bb1dd70fc2ef6a446ebbd7a
Reviewed-on: https://chromium-review.googlesource.com/c/1349314
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611703}