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GOOGLE_CHROME_BUILD is more a branding thing. Since
Google Chrome builds set both GOOGLE_CHROME_BUILD and
OFFICIAL_BUILD, this doesn't have an effect in practice.

People who do non-Google Chrome-branded OFFICIAL_BUILD
asan builds will now get the different flags, which seems
like a good change.

While here, also deduplicate the common flags and add
a comment saying that the OFFICIAL_BUILD asan flags
are basically never used.

Bug: 961769
Change-Id: I42491c1d4d3ab876b0de92d0746266580dafe1d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1882109
Commit-Queue: Alexander Potapenko <glider@chromium.org>
Reviewed-by: Alexander Potapenko <glider@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709905}