Enable ServiceWorkerPerfTest (service_worker.service_worker)

I think https://codereview.chromium.org/884573004/ fixed the ServiceWorker test flakiness.

BUG=433943
TEST=./tools/perf/run_benchmark --browser-executable=~/chromium/src/out/Debug/chrome --also-run-disabled-tests service_worker.service_worker

Review URL: https://codereview.chromium.org/954663002

Cr-Commit-Position: refs/heads/master@{#317807}
1 file changed