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Found while writing docs that this was grammatically incorrect and
inconsistent with other "ValidTraits" around.

TBR=fdoray@chromium.org
(for side-effects outside //base)

Bug: 1002654
Change-Id: Ia8974f79d91021cc258775cdf57b18fe2edc9800
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1795990
Commit-Queue: Gabriel Charette <gab@chromium.org>
Auto-Submit: Gabriel Charette <gab@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695619}