[js] Fix timeouts' url

[JohanLorenzo]

Steps to reproduce

1. Follow steps in this branch https://github.com/JohanLorenzo/geckodriver-bugs/tree/cant-set-timeout

Results

  1) timeouts "before all" hook:
     Uncaught UnknownCommandError: POST /session/68afbb72-991b-49ed-b09b-7d4767978232/timeouts/async_script did not match a known command

GeckoDriver (wires) is more strict about the URLs that you provide to it. They should comply with http://w3c.github.io/webdriver/webdriver-spec.html\#set-timeout . In this case we should not have /timeouts/async_script, but only /timeouts.

r? @jleyba

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[jleyba]

Does this break compatibility with the Selenium server and ChromeDriver?

[JohanLorenzo]

Sorry, I haven't manually checked (I was expecting automated tests to check the APIs behavior). I'll get back to you with testing results.

Edit on June 6th: I'll bring testing results by tomorrow.

Edit on June 7th: I tested Chrome, and Chrome behind Selenium server. They both pass. See content of the tests here https://github.com/JohanLorenzo/geckodriver-bugs/tree/cant-set-timeout . I'll work on adding these tests in the PR.

[JohanLorenzo]

@jleyba Tests done manually and new ones added. r?

Travis failed due to an error with buck. I don't think it's related to my PR.