std: rename str.as_bytes_with_null_consume to str.to_bytes_with_null

src/test/run-pass/foreign-fn-linkname.rs

@@ -26,7 +26,7 @@ mod libc {
 fn strlen(str: ~str) -> uint {
     unsafe {
         // C string is terminated with a zero
-        let bytes = str.as_bytes_with_null_consume();
+        let bytes = str.to_bytes_with_null();
         return libc::my_strlen(vec::raw::to_ptr(bytes));
     }
 }