Revert "Run headless_browsertests, headless_unittests on more bots."

This reverts commit af48666492299fa11d0b6d4f6dc3f6065be7b277.

Reason for revert: Suspected cause of compile error:
https://ci.chromium.org/buildbot/chromium.memory/Linux%20MSan%20Builder/12405

See: https://crbug.com/844865

Original change's description:
> Run headless_browsertests, headless_unittests on more bots.
> 
> Run headless_browsertests, headless_unittests on the the clang tot bots,
> and on some memory bots. Both suites are very leaky, so they don't run on
> asan bots, and headless_browsertests is also very racy so it doesn't run under
> tsan, but headless_unittests runs under tsan. Both run under msan and cfi.
> They also run under asan/mac, which seems to be happy.
> 
> This is part of an effort to reduce the number of test configurations.
> Originally reviewed as part of https://chromium-review.googlesource.com/1061795,
> which I'm now landing in smaller pieces.
> 
> TBR=kbr
> 
> Bug: 843511,843732,843734
> Change-Id: I3ba57446830d44f3651100e216f1d546ee7532b6
> Reviewed-on: https://chromium-review.googlesource.com/1088754
> Commit-Queue: Nico Weber <thakis@chromium.org>
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#564931}

TBR=thakis@chromium.org,kbr@chromium.org

Change-Id: Ie784cbd8138b0096d538c3e2212d45bdfd18255d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 843511, 843732, 843734
Reviewed-on: https://chromium-review.googlesource.com/1089211
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Commit-Queue: Hector Carmona <hcarmona@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564947}
5 files changed