chore: fix demo app compilation error (#8811)

Fixes a compilation error in the demo app when running on a fresh install.

src/cdk/table/table.spec.ts

@@ -6,7 +6,6 @@ import {BehaviorSubject} from 'rxjs/BehaviorSubject';
 import {combineLatest} from 'rxjs/observable/combineLatest';
 import {CdkTableModule} from './index';
 import {Observable} from 'rxjs/Observable';
-import {map} from 'rxjs/operators/map';
 import {
   getTableDuplicateColumnNameError,
   getTableMissingMatchingRowDefError,
@@ -639,7 +638,7 @@ class FakeDataSource extends DataSource<TestData> {
   connect(collectionViewer: CollectionViewer) {
     this.isConnected = true;
     const streams = [this._dataChange, collectionViewer.viewChange];
-    return combineLatest<TestData[]>(streams).pipe(map(([data]) => data));
+    return combineLatest(streams, (data, _) => data);
   }
 
   disconnect() {