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Moving these constants out-of-line means that the dep on
build:branding_buildflags doesn't have to be in public_deps.

No behavior change.

Bug: 961769
Change-Id: I070afcb39d23eee6a1cf0c40e49c064ddc01b353
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1724665Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682240}