Replace deprecated utf16_units method.

src/conversions.rs

@@ -402,7 +402,7 @@ pub unsafe fn latin1_to_string(cx: *mut JSContext, s: *mut JSString) -> String {
 impl ToJSValConvertible for str {
     unsafe fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue) {
         let mut string_utf16: Vec<u16> = Vec::with_capacity(self.len());
-        string_utf16.extend(self.utf16_units());
+        string_utf16.extend(self.encode_utf16());
         let jsstr = JS_NewUCStringCopyN(cx,
                                         string_utf16.as_ptr(),
                                         string_utf16.len() as libc::size_t);

src/lib.rs

@@ -7,7 +7,6 @@
 
 #![feature(core_intrinsics)]
 #![feature(link_args)]
-#![feature(str_utf16)]
 #![feature(unsafe_no_drop_flag)]
 #![feature(const_fn)]
 

src/rust.rs

@@ -124,7 +124,7 @@ impl Runtime {
 
     pub fn evaluate_script(&self, glob: HandleObject, script: String, filename: String, line_num: u32)
                     -> Result<(),()> {
-        let script_utf16: Vec<u16> = script.utf16_units().collect();
+        let script_utf16: Vec<u16> = script.encode_utf16().collect();
         let filename_cstr = ffi::CString::new(filename.as_bytes()).unwrap();
         debug!("Evaluating script from {} with content {}", filename, script);
         // SpiderMonkey does not approve of null pointers.