Fix crash when using title drag on a window opened while split view is active

athena/wm/split_view_controller.h

Index: athena/wm/split_view_controller.h
diff --git a/athena/wm/split_view_controller.h b/athena/wm/split_view_controller.h
index d0e70735e3899f6d892cf028048dddc985ee249e..628c16bf3fcdefc78369e7f91dcde6a928cd4564 100644
--- a/athena/wm/split_view_controller.h
+++ b/athena/wm/split_view_controller.h
@@ -69,11 +69,11 @@ class ATHENA_EXPORT SplitViewController
 
   void UpdateLayout(bool animate);
 
-  void SetWindowTransform(aura::Window* left_window,
-                          const gfx::Transform& transform,
-                          bool animate);
+  void SetWindowTransforms(const gfx::Transform& left_transform,
+                           const gfx::Transform& right_transform,
+                           bool animate);
 
-  void OnAnimationCompleted(aura::Window* window);
+  void OnAnimationCompleted();
 
   void UpdateSeparatorPositionFromScrollDelta(float delta);