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This can be nullptr and this is always checked against nullptr
except this place.

BUG=NONE
TEST=covered by unit test

Change-Id: Ie96065820a16dd14552a03d62ae7b06b4e2facb6
Reviewed-on: https://chromium-review.googlesource.com/1105698Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568515}