auto merge of #16076 : SimonSapin/rust/deprecate-url, r=alexcrichton

The replacement is [rust-url](https://github.com/servo/rust-url), which can be used with Cargo.

Fix #15874
Fix #10707
Close #10706
Close #10705
Close #8486

src/test/compile-fail/deprecated-url.rs

@@ -0,0 +1,20 @@
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// ignore-tidy-linelength
+
+#![deny(deprecated)]
+
+extern crate url;
+
+fn main() {
+    let _ = url::Url::parse("http://example.com");
+    //~^ ERROR use of deprecated item: This is being removed. Use rust-url instead. http://servo.github.io/rust-url/
+}