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Also, replace an existing use of CHROME_VERSION with _MAJOR.

Bug: None
Change-Id: I838874595dd5e4f11df3c2902745b4d3763b9596
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2149402Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758971}