Don't cast manually for NativeWindow*

atom/browser/api/atom_api_browser_window.cc

@@ -1082,12 +1082,7 @@ void BrowserWindow::ToggleTabBar() {
   window_->ToggleTabBar();
 }
 
-void BrowserWindow::AddTabbedWindow(mate::Arguments* args) {
-  NativeWindow* window;
-  if (!args->GetNext(&window)) {
-    args->ThrowError("Insert good error message here");
-    return;
-  }
+void BrowserWindow::AddTabbedWindow(NativeWindow* window, mate::Arguments* args) {
   window_->AddTabbedWindow(window, args);
 }
 

atom/browser/api/atom_api_browser_window.h

@@ -243,7 +243,7 @@ class BrowserWindow : public mate::TrackableObject<BrowserWindow>,
   void MergeAllWindows();
   void MoveTabToNewWindow();
   void ToggleTabBar();
-  void AddTabbedWindow(mate::Arguments* args);
+  void AddTabbedWindow(NativeWindow* window, mate::Arguments* args);
 
   void SetVibrancy(mate::Arguments* args);
   void SetTouchBar(const std::vector<mate::PersistentDictionary>& items);