DevTools: migrate inspector-protocol/dom tests to a new test runner

third_party/WebKit/LayoutTests/inspector-protocol/dom/dom-ns-attr-modified.js

+(async function(testRunner) {
+  var {page, session, dp} = await testRunner.startHTML(`
+    <svg>
+        <a id='main' xlink:href='http://localhost'>link</a>
+    </svg>
+  `, 'Test that DOM events have correct parameters for attribute with namespace in XML document.');
+
+  var response = await dp.DOM.getDocument();
+  await dp.DOM.querySelector({nodeId: response.result.root.nodeId, selector: '#main'});
+
+  testRunner.log('\nChanging attribute...');
+  session.evaluate(() => {
+    var element = document.getElementById('main');
+    element.setAttributeNS('http://www.w3.org/1999/xlink', 'xlink:href', 'changed-url');
+  });
+  var msg = await dp.DOM.onceAttributeModified();
+  var result = msg.params;
+  testRunner.log(`Modified attribute: '${result.name}'='${result.value}'`);
+
+  testRunner.log('Removing attribute...');
+  session.evaluate(() => {
+    var element = document.getElementById('main');
+    element.removeAttribute('xlink:href', 'changed-url');
+  });
+  msg = await dp.DOM.onceAttributeRemoved();
+  var result = msg.params;
+  testRunner.log(`Removed attribute: '${result.name}'`);
+  testRunner.completeTest();
+});
+