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For helpers.h, move the GOOGLE_CHROME_BUILD into just the cc file, so
that the dep on //build:branding_buildflags doesn't have to be a
public_deps and to make branding affect internal APIs less. I'm hoping
to do more changes that move GOOGLE_CHROME_BUILD / GOOGLE_CHROME_BRANDING
from header files going forward.

Bug: 961769
Change-Id: I63f20a91b474865acaee2369900ed7677220468a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1822718
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700246}