Move the dom directory from web-platform-tests/ to wpt/.

third_party/WebKit/LayoutTests/imported/wpt/dom/nodes/Comment-Text-constructor.js

 function test_constructor(ctor) {
   test(function() {
     var object = new window[ctor]();
     assert_equals(Object.getPrototypeOf(object),
                   window[ctor].prototype, "Prototype chain: " + ctor);
     assert_equals(Object.getPrototypeOf(Object.getPrototypeOf(object)),
                   CharacterData.prototype, "Prototype chain: CharacterData");
     assert_equals(Object.getPrototypeOf(Object.getPrototypeOf(Object.getPrototypeOf(object))),
                   Node.prototype, "Prototype chain: Node");
   }, "new " + ctor + "(): prototype chain");
@@ skipping 57 matching lines @@
 
   async_test("new " + ctor + "() should get the correct ownerDocument across globals").step(function() {
     var iframe = document.createElement("iframe");
     iframe.onload = this.step_func_done(function() {
       var object = new iframe.contentWindow[ctor]();
       assert_equals(object.ownerDocument, iframe.contentDocument);
     });
     document.body.appendChild(iframe);
   });
 }