Mark inspector/tracing.html as failing.

Unreviewed gardening.

BUG=341641
TBR=abarth@chromium.org

Review URL: https://codereview.chromium.org/138703007

git-svn-id: svn://svn.chromium.org/blink/trunk@166659 bbb929c8-8fbe-4397-9dbb-9b2b20218538