Revert of Migrate error messages, part 10. (patchset #2 id:20001 of https://coderevie...

Revert of Migrate error messages, part 10. (patchset #2 id:20001 of https://codereview.chromium.org/1126043004/)

Reason for revert:
patch didn't apply correctly.

Original issue's description:
> Migrate error messages, part 10.
>
> R=mvstanton@chromium.org
>
> Committed: https://crrev.com/8608e619afe2b4514b0577bfb73a153b1550d41f
> Cr-Commit-Position: refs/heads/master@{#28357}

TBR=mvstanton@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1130073005

Cr-Commit-Position: refs/heads/master@{#28358}