Fix bug in "Migrate error messages, part 7".
Fix bug in "Migrate error messages, part 7".

TBR=mvstanton@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1124583006

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#28220}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh