Rewrite tests for slots

third_party/WebKit/LayoutTests/shadow-dom/resources/shadow-dom.js

 function removeWhiteSpaceOnlyTextNodes(node)
 {
-    for (var i = 0; i < node.childNodes.length; i++) {
-        var child = node.childNodes[i];
-        if (child.nodeType === Node.TEXT_NODE && child.nodeValue.trim().length == 0) {
-            node.removeChild(child);
-            i--;
-        } else if (child.nodeType === Node.ELEMENT_NODE || child.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
-            removeWhiteSpaceOnlyTextNodes(child);
-        }
+  for (var i = 0; i < node.childNodes.length; i++) {
+    var child = node.childNodes[i];
+    if (child.nodeType === Node.TEXT_NODE && child.nodeValue.trim().length == 0) {
+      node.removeChild(child);
+      i--;
+    } else if (child.nodeType === Node.ELEMENT_NODE || child.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
+      removeWhiteSpaceOnlyTextNodes(child);
     }
-    if (node.shadowRoot) {
-        removeWhiteSpaceOnlyTextNodes(node.shadowRoot);
-    }
+  }
+  if (node.shadowRoot) {
+    removeWhiteSpaceOnlyTextNodes(node.shadowRoot);
+  }
 }
 
 function convertTemplatesToShadowRootsWithin(node) {
     var nodes = node.querySelectorAll("template");
     for (var i = 0; i < nodes.length; ++i) {
         var template = nodes[i];
         var mode = template.getAttribute("data-mode");
         var parent = template.parentNode;
         parent.removeChild(template);
         var shadowRoot;
@@ skipping 159 matching lines @@
 // This function assumes that testharness.js is available.
 function assert_event_path_equals(actual, expected) {
   assert_equals(actual.length, expected.length);
   for (let i = 0; i < actual.length; ++i) {
     assert_equals(actual[i][0], expected[i][0], 'currentTarget at ' + i + ' should be same');
     assert_equals(actual[i][1], expected[i][1], 'target at ' + i + ' should be same');
     assert_equals(actual[i][2], expected[i][2], 'relatedTarget at ' + i + ' should be same');
     assert_array_equals(actual[i][3], expected[i][3], 'composedPath at ' + i + ' should be same');
   }
 }