chore: remove FakeViewportRuler (#9386)

Now that all tests have been moved away from the `FakeViewportRuler`, we can safely get rid of it. In general we should avoid stubbing out the window dimensions, because it can be unreliable and it doesn't work well when something is positioned using `bottom` and `right`.

Author: crisbeto

src/cdk/testing/fake-viewport-ruler.ts

@@ -6,6 +6,4 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-
-
 export * from './public-api';

src/cdk/testing/index.ts

@@ -10,5 +10,4 @@ export * from './dispatch-events';
 export * from './event-objects';
 export * from './type-in-element';
 export * from './wrapped-error-message';
-export * from './fake-viewport-ruler';
 export * from './mock-ng-zone';

src/cdk/testing/public-api.ts

@@ -1,8 +1,6 @@
 import {async, ComponentFixture, TestBed} from '@angular/core/testing';
 import {Component, DebugElement} from '@angular/core';
 import {By} from '@angular/platform-browser';
-import {ViewportRuler} from '@angular/cdk/scrolling';
-import {FakeViewportRuler} from '@angular/cdk/testing';
 import {MatButtonModule} from './index';
 import {MatRipple} from '@angular/material/core';
 
@@ -13,9 +11,6 @@ describe('MatButton', () => {
     TestBed.configureTestingModule({
       imports: [MatButtonModule],
       declarations: [TestApp],
-      providers: [
-        {provide: ViewportRuler, useClass: FakeViewportRuler},
-      ]
     });
 
     TestBed.compileComponents();

src/lib/button/button.spec.ts

@@ -2,8 +2,7 @@ import {async, ComponentFixture, fakeAsync, TestBed, tick} from '@angular/core/t
 import {FormControl, FormsModule, NgModel, ReactiveFormsModule} from '@angular/forms';
 import {Component, DebugElement} from '@angular/core';
 import {By} from '@angular/platform-browser';
-import {ViewportRuler} from '@angular/cdk/scrolling';
-import {dispatchFakeEvent, FakeViewportRuler} from '@angular/cdk/testing';
+import {dispatchFakeEvent} from '@angular/cdk/testing';
 import {RIPPLE_FADE_IN_DURATION, RIPPLE_FADE_OUT_DURATION} from '@angular/material/core';
 import {MatRadioButton, MatRadioChange, MatRadioGroup, MatRadioModule} from './index';
 
@@ -20,9 +19,6 @@ describe('MatRadio', () => {
         StandaloneRadioButtons,
         InterleavedRadioGroup,
         TranscludingWrapper
-      ],
-      providers: [
-        {provide: ViewportRuler, useClass: FakeViewportRuler}
       ]
     });