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This CL allows managed bookmarks to be shown if:
1) There are managed bookmarks from the ManagedBookmarkService,
2) The ManagedBookmarks feature flag is enabled. This flag allows
for a server-side kill switch.

Managed bookmarks are bookmarks that are set by an enterprise policy
and are available in every device managed by that policy.
This folder is a sibling of the Bookmarks Bar, Mobile bookmarks,
and Other bookmarks. The managed bookmarks folder is not editable,
nor any item within it.

This CL disables swiping to delete and long press gesture for any item
or folder that is not user-editable (which includes all descendants of
the managed bookmarks folder). The edit/new folder toolbar is also
hidden for folders that are not user-editable.

Bug: 1065187
Change-Id: If63ee2673576dc8a838f05beb8b81fa301f22a16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2140953
Commit-Queue: edchin <edchin@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758467}