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Revert "[base] Use NO_UNIQUE_ADDRESS in flat_tree"

This reverts commit f55e9981.

Reason for revert: https://crbug.com/1144431

Bug: 1144431

Original change's description:
> [base] Use NO_UNIQUE_ADDRESS in flat_tree
>
> This change makes use of NO_UNIQUE_ADDRESS in flat_tree, allowing the
> removal of an internal class which just existed to make use of the empty
> base optimization.
>
> Bug: 682254
> Change-Id: Iabf91d4acee95c7ba4e929d23528d95b0ced1612
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2509757
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#822948}

TBR=dcheng@chromium.org,jdoerrie@chromium.org

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

Bug: 682254
Change-Id: If3b15e15241e8f8b5d99b80caadbb25153648f37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2514147Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823192}