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/platform-browser-dynamic/testing/dom_test_component_renderer.ts

@@ -6,8 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {TestComponentRenderer} from '@angular/compiler/testing';
 import {Inject, Injectable} from '@angular/core';
+import {TestComponentRenderer} from '@angular/core/testing';
 import {DOCUMENT} from '@angular/platform-browser';
 
 import {getDOM} from '../platform_browser_private';