GitLab

Fix error message by making it a proper sentence.

Bug: 803774
Change-Id: I30feb2f5b9aa92653793db92556aaf29371673ec
Reviewed-on: https://chromium-review.googlesource.com/c/1350962Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Commit-Queue: Rob Buis <rbuis@igalia.com>
Cr-Commit-Position: refs/heads/master@{#611049}