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This is no longer necessary since we only load partner bookmarks on
demand now.

Bug: 832371
Change-Id: Id6b76f7a8278aace0c682a00cd1d490e11311c73
Reviewed-on: https://chromium-review.googlesource.com/1011582Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Maria Khomenko <mariakhomenko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550706}