Fix JSON syntax errors in chromium.fyi test specs.

BUG=178409
TBR=phajdan.jr@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/311863003

git-svn-id: http://src.chromium.org/chrome/trunk/src/testing@274539 4ff67af0-8c30-449e-8e8b-ad334ec8d88c