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It should exist, and we assume that it exists.

I'm not sure how it would not exist, but return in this case to
avoid a crash.

Bug: 1138665
Change-Id: I7a667f4e3744f7f5bb580139962b92860f763d5d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2546853Reviewed-by: Andrew Xu <andrewxu@chromium.org>
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Auto-Submit: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828924}