Revert of Roll gtest-parallel. (patchset #1 id:1 of https://codereview.webrtc.org/2859133002/ )
Revert of Roll gtest-parallel. (patchset #1 id:1 of https://codereview.webrtc.org/2859133002/ )

Reason for revert:
There might be a subtle bug where all tests are always reported as passing.

Original issue's description:
> Roll gtest-parallel c9bb1c9e8a..1e816d0426
>
> * src/third_party/gtest-parallel: https://chromium.googlesource.com/external/github.com/google/gtest-parallel/+log/c9bb1c9e8a..1e816d0426
>
> BUG=chromium:718339
> NOTRY=True
>
> Review-Url: https://codereview.webrtc.org/2859133002
> Cr-Commit-Position: refs/heads/master@{#18005}
> Committed: https://chromium.googlesource.com/external/webrtc/+/5aa3f361299ab60d6ed6e8d7bd469fef8dba3b6b

TBR=kjellander@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:718339

Review-Url: https://codereview.webrtc.org/2856963004
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#18007}

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