servo: Merge #9840 - Update to rust-url 1.0 (from servo:url-1.0); r=asajeffrey

**Do not merge yet:** rust-url 1.0 is not published yet and may still get breaking changes. The goal of this PR for now is to demonstrate API usage.

Depends on:

* <s>https://github.com/servo/rust-url/pull/176</s>
* <s>https://github.com/alexcrichton/cookie-rs/pull/42</s>
* <s>https://github.com/hyperium/hyper/pull/740</s>
* https://github.com/cyderize/rust-websocket/pull/70
* https://github.com/jgraham/webdriver-rust/pull/28

Source-Repo: https://github.com/servo/servo
Source-Revision: 84ab7e9fe8f4a6528995eff3eb6e814cb724c364

servo/components/webdriver_server/lib.rs

@@ -353,7 +353,7 @@ impl Handler {
 
         let url = receiver.recv().unwrap();
 
-        Ok(WebDriverResponse::Generic(ValueResponse::new(url.serialize().to_json())))
+        Ok(WebDriverResponse::Generic(ValueResponse::new(url.as_str().to_json())))
     }
 
     fn handle_window_size(&self) -> WebDriverResult<WebDriverResponse> {