GitLab

There was a crash report indicating this was a null deref, and the code
clearly shows the calling function can return a null pointer so account
for that case.

Bug: chromium:990507
Test: Builds
Change-Id: I3b78de23dca40637661d1a9619adf9c00593c485
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1733739
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Auto-Submit: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684073}