float: Fix const target window

Bug: b/293954921
Change-Id: Ic781391cc3985915a4c7d5a2b41491dd46958ee4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4779308
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Commit-Queue: Sophie Wen <sophiewen@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1183283}
diff --git a/ash/wm/tablet_mode/tablet_mode_multitask_menu_controller.h b/ash/wm/tablet_mode/tablet_mode_multitask_menu_controller.h
index a262d5e73..f68dbca0 100644
--- a/ash/wm/tablet_mode/tablet_mode_multitask_menu_controller.h
+++ b/ash/wm/tablet_mode/tablet_mode_multitask_menu_controller.h
@@ -51,9 +51,7 @@
     return reserved_for_gesture_sent_;
   }
 
-  aura::Window* target_window_for_test() const {
-    return target_window_for_test_;
-  }
+  aura::Window* target_window_for_test() { return target_window_for_test_; }
 
  private:
   void MaybeCreateMultitaskMenu(aura::Window* active_window);