fixup! fix(cdk/table): set default role of table to 'table'

Author: annieyw

src/cdk/table/table.spec.ts

@@ -611,6 +611,19 @@ describe('CdkTable', () => {
   it('should not clobber an existing table role', () => {
     setupTableTestApp(CustomRoleCdkTableApp);
     expect(tableElement.getAttribute('role')).toBe('treegrid');
+
+    expect(getHeaderRows(tableElement)[0].getAttribute('role')).toBe('row');
+    const header = getHeaderRows(tableElement)[0];
+    getHeaderCells(header).forEach(cell => {
+      expect(cell.getAttribute('role')).toBe('columnheader');
+    });
+
+    getRows(tableElement).forEach(row => {
+      expect(row.getAttribute('role')).toBe('row');
+      getCells(row).forEach(cell => {
+        expect(cell.getAttribute('role')).toBe('gridcell');
+      });
+    });
   });
 
   it('should throw an error if two column definitions have the same name', () => {