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[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/+/2509757Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822948}