Remove workarounds for PhantomJS in tests

src/annotator/plugin/test/document-test.js

@@ -30,11 +30,6 @@ describe('DocumentMeta', function() {
     tempDocument.appendChild(tempDocumentHead);
 
     fakeNormalizeURI = sinon.stub().callsFake((url, base) => {
-      if (url === 'http://a:b:c') {
-        // A modern browser would reject this URL, but PhantomJS's URL parser is
-        // more lenient.
-        throw new Error('Invalid URL');
-      }
       return normalizeURI(url, base);
     });
 

src/sidebar/directive/test/util.js

@@ -175,10 +175,7 @@ function createDirective(
 
 /** Helper to dispatch a native event to a DOM element. */
 function sendEvent(element, eventType) {
-  // createEvent() used instead of Event constructor
-  // for PhantomJS compatibility
-  const event = document.createEvent('Event');
-  event.initEvent(eventType, true /* bubbles */, true /* cancelable */);
+  const event = new Event(eventType, { bubbles: true, cancelable: true });
   element.dispatchEvent(event);
 }