build: remove infinite import loops

Fixes some more infinite loops due to a package that tries to import itself.

Author: crisbeto

src/cdk/testing/protractor/protractor-element.ts

@@ -6,10 +6,10 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {ModifierKeys} from '@angular/cdk/testing';
 import {browser, ElementFinder, Key} from 'protractor';
 import {ElementDimensions} from '../element-dimensions';
 import {TestElement, TestKey} from '../test-element';
+import {ModifierKeys} from '../event-objects';
 
 /** Maps the `TestKey` constants to Protractor's `Key` constants. */
 const keyMap = {

src/cdk/testing/testbed/unit-test-element.ts

@@ -7,17 +7,12 @@
  */
 
 import * as keyCodes from '@angular/cdk/keycodes';
-import {
-  clearElement,
-  dispatchMouseEvent,
-  isTextInput,
-  ModifierKeys,
-  triggerBlur,
-  triggerFocus,
-  typeInElement
-} from '@angular/cdk/testing';
 import {TestElement, TestKey} from '../test-element';
 import {ElementDimensions} from '../element-dimensions';
+import {triggerBlur, triggerFocus} from '../element-focus';
+import {isTextInput, clearElement, typeInElement} from '../type-in-element';
+import {dispatchMouseEvent} from '../dispatch-events';
+import {ModifierKeys} from '../event-objects';
 
 /** Maps `TestKey` constants to the `keyCode` and `key` values used by native browser events. */
 const keyMap = {

src/cdk/testing/tests/protractor.e2e.spec.ts

@@ -1,8 +1,8 @@
-import {HarnessLoader} from '@angular/cdk/testing';
-import {ProtractorHarnessEnvironment} from '@angular/cdk/testing/protractor';
 import {browser} from 'protractor';
 import {MainComponentHarness} from './harnesses/main-component-harness';
 import {SubComponentHarness} from './harnesses/sub-component-harness';
+import {HarnessLoader} from '../component-harness';
+import {ProtractorHarnessEnvironment} from '../protractor';
 
 describe('ProtractorHarnessEnvironment', () => {
   beforeEach(async () => {

src/cdk/testing/tests/testbed.spec.ts

@@ -1,10 +1,10 @@
-import {HarnessLoader} from '@angular/cdk/testing';
-import {TestbedHarnessEnvironment} from '@angular/cdk/testing/testbed';
 import {ComponentFixture, TestBed} from '@angular/core/testing';
 import {MainComponentHarness} from './harnesses/main-component-harness';
 import {SubComponentHarness} from './harnesses/sub-component-harness';
 import {TestComponentsModule} from './test-components-module';
 import {TestMainComponent} from './test-main-component';
+import {HarnessLoader} from '../component-harness';
+import {TestbedHarnessEnvironment} from '../testbed/testbed-harness-environment';
 
 function activeElementText() {
   return document.activeElement && (document.activeElement as HTMLElement).innerText || '';