Remove unused helper function

src/lib/core/testing/dispatch-events.ts

@@ -1,8 +1,7 @@
 import {
   createFakeEvent,
   createKeyboardEvent,
-  createMouseEvent,
-  createTransitionEndEvent
+  createMouseEvent
 } from './event-objects';
 
 /** Shorthand to dispatch a fake event on a specified node. */
@@ -19,8 +18,3 @@ export function dispatchKeyboardEvent(node: Node, type: string, keyCode: number)
 export function dispatchMouseEvent(node: Node, type: string, x = 0, y = 0) {
   node.dispatchEvent(createMouseEvent(type, x, y));
 }
-
-/** Shorthand to dispatch a transition event with a specified property. */
-export function dispatchTransitionEndEvent(node: Node, propertyName: string, elapsedTime = 0) {
-  node.dispatchEvent(createTransitionEndEvent(propertyName, elapsedTime));
-}

src/lib/core/testing/event-objects.ts

@@ -38,22 +38,6 @@ export function createKeyboardEvent(type: string, keyCode: number) {
   return event;
 }
 
-/** Creates a transition event with the specified property name. */
-export function createTransitionEndEvent(propertyName: string, elapsedTime = 0) {
-  // Some browsers have the TransitionEvent class, but once the class is being instantiated
-  // the browser will throw an exception. Those browsers don't support the constructor yet.
-  // To ensure that those browsers also work, the TransitionEvent is created by using the
-  // deprecated `initTransitionEvent` function.
-  try {
-    // TypeScript does not have valid types for the TransitionEvent class, so use `any`.
-    return new (TransitionEvent as any)('transitionend', {propertyName, elapsedTime});
-  } catch (e) {
-    let event = document.createEvent('TransitionEvent');
-    event.initTransitionEvent('transitionend', false, false, propertyName, elapsedTime);
-    return event;
-  }
-}
-
 /** Creates a fake event object with any desired event type. */
 export function createFakeEvent(type: string) {
   let event  = document.createEvent('Event');