Revert of Enable Mac headless tests now that headless targets are included on Mac build. (patchset #2 id:20001 of https://codereview.chromium.org/2783053002/ )

Reason for revert:
These tests are failing on Mac10.10 Tests

https://uberchromegw.corp.google.com/i/chromium.mac/builders/Mac10.10%20Tests

Original issue's description:
> Enable Mac headless tests now that headless targets are included on Mac build.
>
> BUG=687407
>
> Review-Url: https://codereview.chromium.org/2783053002
> Cr-Commit-Position: refs/heads/master@{#461362}
> Committed: https://chromium.googlesource.com/chromium/src/+/69dd94f8ffe4b3d279b599fe4bff3445e20c0c1a

TBR=dpranke@chromium.org,skyostil@chromium.org,dvallet@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=687407

Review-Url: https://codereview.chromium.org/2792893002
Cr-Commit-Position: refs/heads/master@{#461370}
1 file changed