Move LowercaseString near its only consumer.

components/util/str.rs

@@ -5,7 +5,6 @@
 use num_traits::ToPrimitive;
 use std::convert::AsRef;
 use std::iter::{Filter, Peekable};
-use std::ops::Deref;
 use std::str::Split;
 
 pub type StaticCharVec = &'static [char];
@@ -117,28 +116,6 @@ pub fn read_exponent<I: Iterator<Item=char>>(mut iter: Peekable<I>) -> Option<i3
     }
 }
 
-#[derive(Clone, Eq, PartialEq, Hash, Debug, Deserialize, Serialize)]
-pub struct LowercaseString {
-    inner: String,
-}
-
-impl LowercaseString {
-    pub fn new(s: &str) -> LowercaseString {
-        LowercaseString {
-            inner: s.to_lowercase(),
-        }
-    }
-}
-
-impl Deref for LowercaseString {
-    type Target = str;
-
-    #[inline]
-    fn deref(&self) -> &str {
-        &*self.inner
-    }
-}
-
 pub fn str_join<I, T>(strs: I, join: &str) -> String
     where I: IntoIterator<Item=T>, T: AsRef<str>,
 {