Throw a SyntaxError if the WebSocket URL can't be parsed. Fix #6061

[Nashenas88]

Fix #6061.

[highfive]

Thanks for the pull request, and welcome! The Servo team is excited to review your changes, and you should hear from @SimonSapin (or someone else) soon.

[hoppipolla-critic-bot]

Critic review: https://critic.hoppipolla.co.uk/r/5043

This is an external review system which you may optionally use for the code review of your pull request.

In order to help critic track your changes, please do not make in-place history rewrites (e.g. via git rebase -i or git commit --amend) when updating this pull request.

[Ms2ger]

Reviewed on critic (though I need to have another look at parse_web_socket_url).

[SimonSapin]

Looks good! Please squash the commits, and this will be good to go. I’ve also edited your PR message to include "Fix #6061" (rather than just the number) so that GitHub will close the issue automatically when this is merged.

[Nashenas88]

Should the S-needs-squash tag get cleared automatically or did I make a mistake?

[SimonSapin]

I don’t think our automation is that good yet. But what did you change? I still see 7 commits.

[Manishearth]

@bors-servo: r=Ms2ger

[bors-servo]

📌 Commit 51ae733 has been approved by Ms2ger

[Nashenas88]

I was doing the rebasing incorrectly. I was passing --autosquash without --interactive.

[bors-servo]

⌛ Testing commit 51ae733 with merge d869a3c...

[bors-servo]

☀️ Test successful - android, gonk, linux1, linux2, mac1, mac2