[Refactor] Replace kFullscreenUsesMinimalChromeKey with WindowState::hide_shelf_when_fullscreen()

ash/system/web_notification/web_notification_tray_unittest.cc

Index: ash/system/web_notification/web_notification_tray_unittest.cc
diff --git a/ash/system/web_notification/web_notification_tray_unittest.cc b/ash/system/web_notification/web_notification_tray_unittest.cc
index d763a5635f5b92d6fb8ebbaea455e043b5f539fe..4fec3e5cecdecb1d03eff54673036121610c3704 100644
--- a/ash/system/web_notification/web_notification_tray_unittest.cc
+++ b/ash/system/web_notification/web_notification_tray_unittest.cc
@@ -16,7 +16,7 @@
 #include "ash/system/tray/system_tray_item.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/test/test_system_tray_delegate.h"
-#include "ash/wm/window_properties.h"
+#include "ash/wm/window_state.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/aura/client/aura_constants.h"
@@ -429,9 +429,10 @@ TEST_F(WebNotificationTrayTest, MAYBE_PopupAndFullscreen) {
   gfx::Rect work_area_auto_hidden = GetPopupWorkArea();
   shelf->SetAutoHideBehavior(SHELF_AUTO_HIDE_BEHAVIOR_NEVER);
 
-  // Make the window to use immersive mode.
-  window->SetProperty(internal::kFullscreenUsesMinimalChromeKey, true);
+  // Make the window use browser immersive fullscreen.
   window->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_FULLSCREEN);
+  wm::GetWindowState(window.get())->SetFullscreenType(
+      wm::FULLSCREEN_TYPE_IMMERSIVE_MINIMAL_CHROME);
   RunAllPendingInMessageLoop();
 
   // The work area for auto-hidden status of fullscreen is a bit larger