chore: fix example compilation error (#10049)

Fixes a compilation error in the examples, presumably due to a faulty rebase.

Author: crisbeto

src/material-examples/bottom-sheet-overview/bottom-sheet-overview-example.ts

@@ -28,8 +28,4 @@ export class BottomSheetOverviewExampleSheet {
     this.bottomSheetRef.dismiss();
     event.preventDefault();
   }
-
-  openLink(event) {
-    window.open(event.target.href);
-  }
 }