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clang automatically checks this value is correctly set, and it
simplifies macro usage.

Bug: 742517
Change-Id: I3b53752a7ac00e33167b9fb42fb3801ef8e7d378
Reviewed-on: https://chromium-review.googlesource.com/c/1308082Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605030}