fix(testing): remove deprecated testing APIs (#9923)

See https://github.com/angular/angular/blob/master/CHANGELOG.md for
prior deprecation and how to update.

modules/@angular/core/test/di/reflective_injector_spec.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {beforeEach, ddescribe, describe, expect, iit, it} from '@angular/core/testing';
+import {expect} from '@angular/core/testing/testing_internal';
 
 import {BaseException} from '../../src/facade/exceptions';
 import {isBlank, isPresent, stringify} from '../../src/facade/lang';

modules/@angular/core/test/di/reflective_key_spec.ts

@@ -7,7 +7,6 @@
  */
 
 import {KeyRegistry, ReflectiveKey} from '@angular/core/src/di/reflective_key';
-import {beforeEach, describe, expect, iit, it} from '@angular/core/testing';
 
 export function main() {
   describe('key', function() {