Minor test cleanup of table-cell-changes-to-colgroup.html

third_party/WebKit/LayoutTests/paint/tables/table-cell-changes-to-colgroup.html

Index: third_party/WebKit/LayoutTests/paint/tables/table-cell-changes-to-colgroup.html
diff --git a/third_party/WebKit/LayoutTests/paint/tables/table-cell-changes-to-colgroup.html b/third_party/WebKit/LayoutTests/paint/tables/table-cell-changes-to-colgroup.html
index d1444acc6737650e8ac1d36d02436d4b88bbde15..aeff4715bf140609db6de68b3bcade1888ac2877 100644
--- a/third_party/WebKit/LayoutTests/paint/tables/table-cell-changes-to-colgroup.html
+++ b/third_party/WebKit/LayoutTests/paint/tables/table-cell-changes-to-colgroup.html
@@ -2,30 +2,30 @@
 <script src="../../resources/run-after-layout-and-paint.js"></script>
 <!-- Test passes if it does not crash on an ASAN build. -->
 <style>
-.c7 {
+.tableColumnGroup {
   background: white;
   display: table-column-group;
 }
-.c13 {
+.tableCell {
   display: table-cell;
   border-style: ridge;
   will-change: transform;
 }
 </style>
 <script>
-var label = document.createElement('label');
-label.setAttribute('class', 'c13');
-document.documentElement.appendChild(label);
-var colgroup = document.createElement('colgroup');
-colgroup.setAttribute('class', 'c13');
-document.documentElement.appendChild(colgroup);
-var aside = document.createElement('aside');
-aside.setAttribute('class', 'c13');
-document.documentElement.appendChild(aside);
+function createAndAppendWithClass(targetType, targetClass) {
+  var targetElement = document.createElement(targetType);
+  targetElement.setAttribute('class', targetClass);
+  document.documentElement.appendChild(targetElement);
+  return targetElement;
+}
+var label = createAndAppendWithClass('label', 'tableCell');
+var colgroup = createAndAppendWithClass('colgroup', 'tableCell');
+createAndAppendWithClass('aside', 'tableCell');
 if (window.testRunner)
   testRunner.waitUntilDone();
 runAfterLayoutAndPaint(function() {
-  colgroup.setAttribute('class', 'c11');
-  label.setAttribute('class', 'c7');
+  colgroup.setAttribute('class', '');
+  label.setAttribute('class', 'tableColumnGroup');
 }, true);
 </script>