Remove as_slice() calls from script.

components/script/dom/bindings/conversions.rs

@@ -312,7 +312,7 @@ impl ToJSValConvertible for str {
 
 impl ToJSValConvertible for DOMString {
     fn to_jsval(&self, cx: *mut JSContext) -> JSVal {
-        self.as_slice().to_jsval(cx)
+        (**self).to_jsval(cx)
     }
 }
 

components/script/dom/bindings/str.rs

@@ -30,7 +30,7 @@ impl ByteString {
     /// Returns the underlying vector as a slice.
     pub fn as_slice<'a>(&'a self) -> &'a [u8] {
         let ByteString(ref vector) = *self;
-        vector.as_slice()
+        vector
     }
 
     /// Returns the length.