Win7: No warnings as errors in FragData test. Applies to all Windows because we currently don't have a way to check which version we're on. The fallback to the old compiler is generating a warning. This test was being overly conservative. Also updates a few message strings. Bug: chromium:920704 Change-Id: If83677881e85d6a6f9ad98b33cd5f7d917bbec6b Reviewed-on: https://chromium-review.googlesource.com/c/1492311 Commit-Queue: Jamie Madill <jmadill@google.com> Reviewed-by: Jamie Madill <jmadill@google.com>