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Now that it's no longer in a .h file, move its definition from
depending on GOOGLE_CHROME_BUILD to GOOGLE_CHROME_BRANDING, which
is the same thing in BUILDFLAG form. Since the use is now in a .cc
file, the buildflag doesn't have to be a public_dep, switching
between branded and non-branded requires fewer rebuilds, and
it's easier to see which files depend on the branding define.

No intended behavior change.

Bug: 961769
Change-Id: I5abcc4cad3bd709792572d643aea173ad1a0996f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893373
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Roger Tawa <rogerta@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711277}