Revert of Import wpt@357b83b809e3cbc7a1805e7c3ca108a7980d782f

third_party/WebKit/LayoutTests/imported/wpt/svg/linking/scripted/testcommon.js

-/**
- * The const var for SVG and xlink namespaces
- */
-const SVGNS = 'http://www.w3.org/2000/svg';
-const XLINKNS = 'http://www.w3.org/1999/xlink';
-
-/**
- * Appends a svg element to the parent.
- *
- * @param test The testharness.js Test object. If provided, this will be used
- *             to register a cleanup callback to remove the div when the test
- *             finishes.
- * @param tag The element tag name.
- * @param parent The parent element of this new created svg element.
- * @param attrs  A dictionary object with attribute names and values to set on
- *               the div.
- */
-function createSVGElement(test, tag, parent, attrs) {
-  var elem = document.createElementNS(SVGNS, tag);
-  if (attrs) {
-    for (var attrName in attrs) {
-      elem.setAttribute(attrName, attrs[attrName]);
-    }
-  }
-  parent.appendChild(elem);
-  test.add_cleanup(function() {
-    elem.remove();
-  });
-  return elem;
-}
-
-/**
- * Create a Promise object which resolves when a specific event fires.
- *
- * @param object The event target.
- * @param name The event name.
- */
-function waitEvent(object, name) {
-  return new Promise(function(resolve) {
-    object.addEventListener(name, resolve, { once: true });
-  });
-}