Border could change the appearance of <select> element in WebKit (#36595)

* In order to make the test css/css-sizing/contain-intrinsic-size/contain-intrinsic-size-032.html works in WebKit, this patch adds border to the select elements of both test cases and reference.

diff --git a/css/css-sizing/contain-intrinsic-size/contain-intrinsic-size-032.html b/css/css-sizing/contain-intrinsic-size/contain-intrinsic-size-032.html
index f55364b..6dfb73a 100644
--- a/css/css-sizing/contain-intrinsic-size/contain-intrinsic-size-032.html
+++ b/css/css-sizing/contain-intrinsic-size/contain-intrinsic-size-032.html
@@ -19,11 +19,11 @@
 }
 select {
   padding: 0;
+  border: solid;
+  margin: 5px;
 }
 .test {
   contain: size;
-  border: solid;
-  margin: 5px;
 }
 </style>