GitLab

These were part of the old bookmark sync implementation and not used
anymore.

With this, the ModelAssociator interface becomes unused and is removed
too.

profile_sync_service_bookmark_unittest.cc basically contained unit tests
for the two removed classes, also based on low-level directory code.
These are not relevant anymore and so are also removed.

Bug: 933756
Change-Id: I616f38ab9170d3d3fdae5eac427c8eda1c0ab658
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863808
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707790}