This only showed up on Linux/standalone builds for me. The error
was added during the Debug extension patch.

Change-Id: Ibfcbdb61a71f30e863a10719c552ce662f835256
Reviewed-on: https://chromium-review.googlesource.com/320330
Tryjob-Request: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>