fixup! test(material-experimental/mdc-slider): add directionality tests

Author: wagnermaciel

src/material-experimental/mdc-slider/slider.spec.ts

@@ -1872,29 +1872,6 @@ class RangeSliderWithTwoWayBinding {
   endValue = 100;
 }
 
-@Component({
-  template: `
-  <div dir="rtl">
-    <mat-slider>
-      <input matSliderThumb>
-    </mat-slider>
-  </div>
-  `
-})
-class RTLSlider {}
-
-@Component({
-  template: `
-  <div dir="rtl">
-    <mat-slider>
-      <input matSliderStartThumb>
-      <input matSliderEndThumb>
-    </mat-slider>
-  </div>
-  `
-})
-class RTLRangeSlider {}
-
 /** The pointer event types used by the MDC Slider. */
 const enum PointerEventType {
   POINTER_DOWN = 'pointerdown',