Non-telemetry benchmarks (angle_perftests, net_perftests, cc_perftests, gpu_perftests, tracing_perftests, load_library_perf_tests, media_perftests, performance_browser_tests) need to output json-test-results format instead of simplified json results.

https://cs.chromium.org/chromium/src/testing/scripts/run_gtest_perf_test.py?l=128

Once that is complete, the change https://chromium-review.googlesource.com/c/chromium/tools/build/+/663787 can be reverted.

(Following from  crbug.com/764350 )