chore: fix e2e axe failure (#9929)

crisbeto · tinayuangao · commit a259e4c8f994 · 2018-02-20T13:19:08.000-08:00
diff --git a/src/e2e-app/e2e-app/e2e-app.html b/src/e2e-app/e2e-app/e2e-app.html
@@ -25,5 +25,5 @@
 </mat-nav-list>
 
 <main>
-  <router-outlet role="main"></router-outlet>
+  <router-outlet></router-outlet>
 </main>
