[telemetry] - Change default benchmark list to use chartjson output.

[telemetry] - Change default benchmark list to use chartjson output.

Waterfall is running on chartjson now, but we've got hacks in the recipes to swap the command lines from buildbot->chartjson.

ie. instead of:

{
  "steps": {
    "blink_perf.animation": {
      "cmd": "/path/to/run_benchmark -v --output-format=buildbot the_test",
      "device_affinity": -1,
      "perf_dashboard_id": "foo"
    },
}

->

{
  "steps": {
    "blink_perf.animation": {
      "cmd": "/path/to/run_benchmark -v --output-format=chartjson --upload-results the_test",
      "device_affinity": -1,
      "perf_dashboard_id": "foo"
    },
}

BUG=422173, 422174

Review URL: https://codereview.chromium.org/779223004

Cr-Commit-Position: refs/heads/master@{#307072}