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MAC_OS_X_VERSION_10_12 is true if Chromium is being built with the
macOS 10.12 SDK or newer, as it’s been since mid 2017.

MAC_OS_X_VERSION_10_12 is not a runtime check for macOS 10.12
and cannot be used as such.

Bug: 1044838
Change-Id: Ia8e40d0f3aab0405e423847dcf9ea1ea2f535091
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2016846
Auto-Submit: Avi Drissman <avi@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734617}