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

chrome/browser/notifications/fullscreen_notification_blocker.cc

Index: chrome/browser/notifications/fullscreen_notification_blocker.cc
diff --git a/chrome/browser/notifications/fullscreen_notification_blocker.cc b/chrome/browser/notifications/fullscreen_notification_blocker.cc
index 0d5b350dff4284fa3261cc19d46974585d740f11..9bf2930b8b41d4d6a5164b25a672d29132841a5d 100644
--- a/chrome/browser/notifications/fullscreen_notification_blocker.cc
+++ b/chrome/browser/notifications/fullscreen_notification_blocker.cc
@@ -13,7 +13,7 @@
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "ash/system/system_notifier.h"
-#include "ash/wm/window_properties.h"
+#include "ash/wm/window_state.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #endif
@@ -33,10 +33,13 @@ bool DoesFullscreenModeBlockNotifications() {
     const aura::Window* fullscreen_window =
         controller->GetTopmostFullscreenWindow();
 
-    // Should appear notifications if kFullscreenUsesMinimalChromeKey is set,
-    // since shelf/message_center UI is visible in such situation.
-    return fullscreen_window && !fullscreen_window->GetProperty(
-        ash::internal::kFullscreenUsesMinimalChromeKey);
+    // Notifications should appear if the fullscreen type is
+    // ash::wm::FULLSCREEN_TYPE_IMMERSIVE_MINIMAL_CHROME because the shelf and
+    // message center UI are visible in this case.
+    if (!fullscreen_window)
+      return false;
+    return ash::wm::GetWindowState(fullscreen_window)->fullscreen_type() !=
+        ash::wm::FULLSCREEN_TYPE_IMMERSIVE_MINIMAL_CHROME;
   }
 #endif