Causing a lot of red and failure to merge presubmits.

https://travis-ci.org/angular/angular/jobs/106581397
Failures:

1. WebWorkers Kitchen Sink should change greeting
   Message:
   Failed: No element found using locator: By.cssSelector("hello-app .changeButton")
   Stack:
   NoSuchElementError: No element found using locator: By.cssSelector("hello-app .changeButton")
   at process._tickCallback (node.js:401:9)
   Error
   at Object. (playground/e2e_test/web_workers/kitchen_sink/kitchen_sink_spec.ts:28:48)
   From: Task: Run it("should change greeting") in control flow
   at attemptAsync (/home/travis/build/angular/angular/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:1819:24)
   at QueueRunner.run (/home/travis/build/angular/angular/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:1774:9)
   at QueueRunner.execute (/home/travis/build/angular/angular/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:1762:10)
   at Spec.Env.queueRunnerFactory (/home/travis/build/angular/angular/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:627:35)
   at Spec.execute (/home/travis/build/angular/angular/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:353:10)
   at Object.fn (/home/travis/build/angular/angular/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:2360:37)
   at attemptAsync (/home/travis/build/angular/angular/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:1819:24)
   at QueueRunner.run (/home/travis/build/angular/angular/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:1774:9)
   at /home/travis/build/angular/angular/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:1801:16
   From asynchronous test:
   Error
   at Suite. (playground/e2e_test/web_workers/kitchen_sink/kitchen_sink_spec.ts:22:3)
   at addSpecsToSuite (/home/travis/build/angular/angular/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:743:25)
   at Env.describe (/home/travis/build/angular/angular/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:713:7)
   at jasmineInterface.describe (/home/travis/build/angular/angular/node_modules/jasmine-core/lib/jasmine-core/jasmine.js:3219:18)
   at Object. (playground/e2e_test/web_workers/kitchen_sink/kitchen_sink_spec.ts:4:1)
   Ran 47 of 48 specs