Rename PlatformScreen to ScreenManager.

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 708298c89083d6603e88a59b83f8931294f1e236..2c0ded3dc2b74414cf9bb21d6683851337ee340f 100644
--- a/services/ui/ws/window_tree_unittest.cc
+++ b/services/ui/ws/window_tree_unittest.cc
@@ -1355,10 +1355,10 @@ TEST_F(WindowTreeShutdownTest, DontSendMessagesDuringShutdown) {
     // Create a tree with one window.
     WindowServerTestHelper ws_test_helper;
     WindowServer* window_server = ws_test_helper.window_server();
-    TestPlatformScreen platform_screen;
-    platform_screen.Init(window_server->display_manager());
+    TestScreenManager screen_manager;
+    screen_manager.Init(window_server->display_manager());
     window_server->user_id_tracker()->AddUserId(kTestUserId1);
-    platform_screen.AddDisplay();
+    screen_manager.AddDisplay();
 
     AddWindowManager(window_server, kTestUserId1);
     window_server->user_id_tracker()->SetActiveUserId(kTestUserId1);