Step 5 for debugging crbug.com/574272

Make the test produce special result on win7 (not the default fallback
on windows) and mac10.11 (the default fallback on mac).

BUG=574272

Review URL: https://codereview.chromium.org/2066403002 .

Cr-Commit-Position: refs/heads/master@{#399982}
2 files changed