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This reverts commit d3742a4b.

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

Original change's description:
> [base] Add NO_UNIQUE_ADDRESS attribute
>
> This change adds the HAS_CPP_ATTRIBUTE and NO_UNIQUE_ADDRESS macros to
> base/compiler_specific.h. This allows using the C++20 no_unique_address
> attribute in prior dialects if the compiler supports it.
>
> Bug: None
> Change-Id: I6aff82e7b195f5eaf93551049c9dfa6a3fd1fbc6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510396
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#822768}

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

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

Bug: None
Change-Id: I375099e835dbc7d4cab98cc15faf66124335bb0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2514208
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823202}