fix(material/form-field): fix duplicate announcement of form controls

Fix duplicate screen reader announcement of form controls.

Remove the aria-owns from the form label. Commit
4191b4d added aria-owns on the label to
work around issue in JAWS and NVDA. That commit is from 2017, and it
appears the JAWS and NVDA issues have been fixed.

src/material/form-field/form-field.html

@@ -10,17 +10,13 @@
     as part of the label, and we don't want to spend resources on walking through projected content
     to set `aria-hidden`. Nor do we want to set `aria-labelledby` on every form control if we could
     simply link the label to the control using the label `for` attribute.
-
-    *Note*: We add aria-owns as a workaround for an issue in JAWS & NVDA where the label isn't
-    read if it comes before the control in the DOM.
   -->
   <label matFormFieldFloatingLabel
          [floating]="_shouldLabelFloat()"
          [monitorResize]="_hasOutline()"
          *ngIf="_hasFloatingLabel()"
          [id]="_labelId"
-         [attr.for]="_control.id"
-         [attr.aria-owns]="_control.id">
+         [attr.for]="_control.id">
     <ng-content select="mat-label"></ng-content>
     <!--
       We set the required marker as a separate element, in order to make it easier to target if

src/material/input/input.spec.ts

@@ -188,20 +188,6 @@ describe('MatMdcInput without forms', () => {
     expect(inputElement.id).toEqual(labelElement.getAttribute('for')!);
   }));
 
-  it('should add aria-owns to the label for the associated control', fakeAsync(() => {
-    let fixture = createComponent(MatInputTextTestController);
-    fixture.detectChanges();
-
-    const inputElement: HTMLInputElement = fixture.debugElement.query(
-      By.css('input'),
-    )!.nativeElement;
-    const labelElement: HTMLInputElement = fixture.debugElement.query(
-      By.css('label'),
-    )!.nativeElement;
-
-    expect(labelElement.getAttribute('aria-owns')).toBe(inputElement.id);
-  }));
-
   it('should add aria-required reflecting the required state', fakeAsync(() => {
     const fixture = createComponent(MatInputWithRequired);
     fixture.detectChanges();