Stop using xvfb just for Chrome

[alexeagle]

two possible resolutions:

• make use of a browser that doesn't have a headless mode - we have Firefox in the docker image already
• remove the xvfb setup (probably from the docker image too)

/cc @gregmagolan maybe an easy chore for you to pick up? You already pointed this out

[Toxicable]

Would it not be possible to use puppeteer here instead?
You can (apparently) do this in your protractor conf by pointing the chromeOptions.binary to puppeteers executable path instead, which has no external deps

[alexeagle]

Greg is switching over to puppeteer for rules_typescript to work under Windows - we'll probably want to switch the rest of our repos away from xvfb

[gregmagolan]

protractor_web_test_suite in angular/angular#24370 will allow running the e2e tests without needing xvbf

[filipesilva]

For reference, this PR was last time I tried to use chrome headless in angular/angular: angular/angular#18327

[gregmagolan]

Will be resolved in #160

[gregmagolan]

Resolved with #160