Remove CreateDefaultDisplay().

services/ui/ws/window_tree_unittest.cc

Index: services/ui/ws/window_tree_unittest.cc
diff --git a/services/ui/ws/window_tree_unittest.cc b/services/ui/ws/window_tree_unittest.cc
index 9d5eacaee1dd16b51c221404d8ede13b2a4ca318..e696b88a728c79bcedaf470e901c75771af9bb26 100644
--- a/services/ui/ws/window_tree_unittest.cc
+++ b/services/ui/ws/window_tree_unittest.cc
@@ -1357,8 +1357,7 @@ TEST_F(WindowTreeShutdownTest, DontSendMessagesDuringShutdown) {
     WindowServer* window_server = ws_test_helper.window_server();
     window_server->user_id_tracker()->AddUserId(kTestUserId1);
     const int kNumHostsToCreate = 1;
-    ws_test_helper.window_server_delegate()->set_num_displays_to_create(
-        kNumHostsToCreate);
+    ws_test_helper.window_server_delegate()->CreateDisplays(kNumHostsToCreate);
 
     WindowManagerWindowTreeFactorySetTestApi(
         window_server->window_manager_window_tree_factory_set())