Downloading benchmark jetstream's source files one by one from https://browserbench.org by using wget is time consuming and not stable, this PR updates the scripts to download the files from https://github.com/mozilla/perf-automation.
Downloading benchmark jetstream's source files one by one from https://browserbench.org by using wget is time consuming and not stable, this PR updates the scripts to download the files from https://github.com/mozilla/perf-automation.