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This reverts commit d35a5b72.

Reason for revert: suspect of causing crashes.

Bug: 1040498

Original change's description:
> Bookmark sync: use GUID as temporary server ID during commit
> 
> This patch effectively relands the logic reverted in
> https://chromium-review.googlesource.com/c/chromium/src/+/1864800 which
> caused crashes in the past (CHECK failures).
> 
> In this new form, the underlying issue is addressed: for users that
> don't use GUID-based merging of bookmarks, local GUIDs are reassigned
> randomly to avoid GUID collisions in the local bookmark model.
> 
> Bug: 978430,1004205
> Change-Id: I812d1cfe1c12b766799e6c5ec238f95fd16139ad
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1983231
> Commit-Queue: Mikel Astiz <mastiz@chromium.org>
> Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#729405}

TBR=mastiz@chromium.org,mamir@chromium.org

Change-Id: Ia25a087dacc36e8ca6ad351a4664e9478b1ba23a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 978430, 1004205
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1991628Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729720}