diff --git a/ash/shell/shell_delegate_impl.cc b/ash/shell/shell_delegate_impl.cc
index 58076ab7..eb6839c 100644
--- a/ash/shell/shell_delegate_impl.cc
+++ b/ash/shell/shell_delegate_impl.cc
@@ -17,7 +17,7 @@
 #include "ash/shell/toplevel_window.h"
 #include "ash/shell_window_ids.h"
 #include "ash/system/tray/default_system_tray_delegate.h"
-#include "ash/wm/window_util.h"
+#include "ash/wm/window_state.h"
 #include "base/message_loop/message_loop.h"
 #include "ui/aura/window.h"
 #include "ui/views/corewm/input_method_event_filter.h"
@@ -81,9 +81,9 @@
 }
 
 void ShellDelegateImpl::ToggleMaximized() {
-  aura::Window* window = ash::wm::GetActiveWindow();
-  if (window)
-    ash::wm::ToggleMaximizedWindow(window);
+  wm::WindowState* window_state = wm::GetActiveWindowState();
+  if (window_state)
+    window_state->ToggleMaximized();
 }
 
 void ShellDelegateImpl::OpenFileManager(bool as_dialog) {