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Failure could not be reproduced locally on a Chrome OS debug build;
this is a speculative fix based on the stack trace.

Bug: 1028272
Change-Id: I1c10839a82061b6ce4daf7a1d8d80ce0e6210dbe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1935720Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719242}