diff --git a/shell/browser/native_window_views.cc b/shell/browser/native_window_views.cc
index 19fd6c6750b6..51203d20c07b 100644
--- a/shell/browser/native_window_views.cc
+++ b/shell/browser/native_window_views.cc
@@ -20,7 +20,7 @@
 #include <utility>
 #include <vector>
 
-#include "base/containers/contains.h"
+#include "base/containers/fixed_flat_set.h"
 #include "base/memory/raw_ref.h"
 #include "base/numerics/ranges.h"
 #include "base/strings/utf_string_conversions.h"
@@ -1157,9 +1157,9 @@ void NativeWindowViews::SetAlwaysOnTop(ui::ZOrderLevel z_order,
   if (z_order != ui::ZOrderLevel::kNormal) {
     // On macOS the window is placed behind the Dock for the following levels.
     // Re-use the same names on Windows to make it easier for the user.
-    static const std::vector<std::string> levels = {
-        "floating", "torn-off-menu", "modal-panel", "main-menu", "status"};
-    behind_task_bar_ = base::Contains(levels, level);
+    static constexpr auto levels = base::MakeFixedFlatSet<std::string_view>(
+        {"floating", "torn-off-menu", "modal-panel", "main-menu", "status"});
+    behind_task_bar_ = levels.contains(level);
   }
 #endif
   MoveBehindTaskBarIfNeeded();