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This reverts commit 71b865f4.

Reason for revert: break many perf tests (see https://ci.chromium.org/buildbot/chromium.perf/linux-perf/307)

Original change's description:
> gtest perf tests: Output well formed test results json
> 
> This CL changes the run_gtest_perf_test.py script to output well formed
> test results json.
> 
> Bug: 855234
> Change-Id: Ia5ce6e258865e34a2aa37635c014cd54efa62796
> Reviewed-on: https://chromium-review.googlesource.com/1112635
> Commit-Queue: Stephen Martinis <martiniss@chromium.org>
> Reviewed-by: Dirk Pranke <dpranke@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#570943}

TBR=dpranke@chromium.org,nednguyen@google.com,martiniss@chromium.org,eyaich@chromium.org

Change-Id: Ia0aaff923014438005ebc0a8677c3bbbebb808ac
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 855234
Reviewed-on: https://chromium-review.googlesource.com/1118238Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#571083}