Replace ByteString::as_slice() by a Deref implementation.

components/script/dom/bindings/str.rs

@@ -6,6 +6,7 @@
 
 use std::borrow::ToOwned;
 use std::hash::{Hash, Hasher};
+use std::ops;
 use std::str;
 use std::str::FromStr;
 
@@ -27,12 +28,6 @@ impl ByteString {
         str::from_utf8(&vec).ok()
     }
 
-    /// Returns the underlying vector as a slice.
-    pub fn as_slice<'a>(&'a self) -> &'a [u8] {
-        let ByteString(ref vector) = *self;
-        vector
-    }
-
     /// Returns the length.
     pub fn len(&self) -> usize {
         let ByteString(ref vector) = *self;
@@ -158,6 +153,13 @@ impl FromStr for ByteString {
     }
 }
 
+impl ops::Deref for ByteString {
+    type Target = [u8];
+    fn deref(&self) -> &[u8] {
+        &self.0
+    }
+}
+
 /// A string that is constructed from a UCS-2 buffer by replacing invalid code
 /// points with the replacement character.
 pub struct USVString(pub String);