Remove use of specialization in http.

core/http/src/lib.rs

@@ -1,4 +1,3 @@
-#![feature(specialization)]
 #![feature(proc_macro_hygiene)]
 #![feature(crate_visibility_modifier)]
 #![recursion_limit="512"]

core/http/src/raw_str.rs

@@ -401,13 +401,6 @@ impl AsRef<[u8]> for RawStr {
     }
 }
 
-impl ToString for RawStr {
-    #[inline(always)]
-    fn to_string(&self) -> String {
-        String::from(self.as_str())
-    }
-}
-
 impl Deref for RawStr {
     type Target = str;
 

core/http/src/uncased.rs

@@ -277,13 +277,6 @@ impl<'s, 'c: 's> From<Cow<'c, str>> for Uncased<'s> {
     }
 }
 
-impl<'s, 'c: 's, T: Into<Cow<'c, str>>> From<T> for Uncased<'s> {
-    #[inline(always)]
-    default fn from(string: T) -> Self {
-        Uncased::new(string)
-    }
-}
-
 impl<'b> PartialOrd<Uncased<'b>> for Uncased<'_> {
     #[inline(always)]
     fn partial_cmp(&self, other: &Uncased<'b>) -> Option<Ordering> {