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The chrome_ui_overrides feature allowed developers to override the
native bookmarks UI, but never shipped and has since been removed.
Remove the corresponding documentation.

Bug: 894447
Change-Id: Ie81762ef92ac92b54a834fc2e9621fa737670467
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2130630Reviewed-by: Mike Wittman <wittman@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755179}