Remove string_cache dependency from util.

Move `namespace::from_domstring` from util to script::dom, because it is used
only in that crate.

components/util/Cargo.toml

@@ -32,6 +32,4 @@ num_cpus = "0.2.2"
 cssparser = "0.3.1"
 num = "0.1.24"
 url = "*"
-string_cache = "0.1"
-string_cache_plugin = "0.1"
 euclid = "0.1"

components/util/lib.rs

@@ -18,8 +18,6 @@
 #![feature(step_trait)]
 #![feature(zero_one)]
 
-#![plugin(string_cache_plugin)]
-
 #[macro_use] extern crate log;
 
 extern crate azure;
@@ -34,7 +32,6 @@ extern crate num_cpus;
 extern crate rand;
 extern crate rustc_serialize;
 extern crate smallvec;
-extern crate string_cache;
 extern crate url;
 
 use std::sync::Arc;
@@ -48,7 +45,6 @@ pub mod linked_list;
 pub mod geometry;
 pub mod logical_geometry;
 pub mod mem;
-pub mod namespace;
 pub mod opts;
 pub mod persistent_list;
 pub mod range;

components/util/namespace.rs

@@ -1,14 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-use str::DOMString;
-use string_cache::{Atom, Namespace};
-
-pub fn from_domstring(url: Option<DOMString>) -> Namespace {
-    match url {
-        None => ns!(""),
-        Some(ref s) => Namespace(Atom::from_slice(s)),
-    }
-}
-