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Permanent folders such as the "bookmark bar" are placed directly under
the bookmarks root node.

Before this CL:
Permanent folders were assumed to have a specifics parent id.
This is wrong, since the bookmark root node is synced and assigned a
non-fixed id on the server. This caused dropping the mobile bookmarks
folder when received as a remote creation.

After this CL:
Permanent nodes are detected via the existence of a unique server tag.

Bug: 516866
Change-Id: I237613ace3cc037febfb3f57257b24cc36522628
Reviewed-on: https://chromium-review.googlesource.com/c/1257833Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596678}