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This fixes a clusterfuzz crash that is hard to reproduce in test
environments.

Bug: 899575
Change-Id: Ic901c580769ab539850d97360e28727078033e56
Reviewed-on: https://chromium-review.googlesource.com/c/1338084
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608745}