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Splitting the "bookmarks" target further than it previously was. This
will allow the reuse of various components and creation of another
target which will enable an edit-only flow, with reduced dependencies.

Bug: 1133294
Change-Id: I62469eee5deb06279dc16d6a7a02d56fe48e76a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440310
Commit-Queue: Sebastien Lalancette <seblalancette@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813743}