fixup! refactor(material/chips): switch to lazy ripple rendering

Author: wagnermaciel

src/material/chips/chip.spec.ts

@@ -11,7 +11,6 @@ describe('MDC-based MatChip', () => {
   let chipDebugElement: DebugElement;
   let chipNativeElement: HTMLElement;
   let chipInstance: MatChip;
-  let chipRippleDebugElement: DebugElement;
 
   let dir = 'ltr';