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This reverts commit b6a3c9f3.

Reason for revert: bookmarks created around 2016, between [M44..M51]
use an uppercase GUID as originator client item ID.

Original change's description:
> Enforce lower-case use of GUIDs for sync
> 
> base::GenerateGUID() produces lower-case GUIDs and they should get
> exposed to the sync protocol exclusively in this canonical form to avoid
> running into issues.
> 
> This patch replaces all occurrences in sync codebase with:
> git grep -l 'IsValidGUID' -- components/sync* | \
>   xargs sed -i 's/IsValidGUID/IsValidGUIDOutputString/g'
> 
> In addition, the implicit GUIDs used for bookmark sync, in particular
> for permanent nodes, are updated to adopt lower-case GUIDs. These are
> never committed to the server so there are no backward-compatibility
> considerations.
> 
> Change-Id: I0d0468f3475e1a27a161e2af15853c757f53e201
> Bug: 978430
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2054154
> Reviewed-by: Marc Treib <treib@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Commit-Queue: Mikel Astiz <mastiz@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#741381}

TBR=sky@chromium.org,treib@chromium.org,mastiz@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 978430
Change-Id: If3a135e24cb61d15cfc7616dd1160e76ce9dd3e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2061749Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742118}