Dragging any border of a window with `setAspectRatio` does not make the window larger. But it works if you want to make window smaller.

Steps to reproduce:
1) `git clone https://github.com/electron/electron-quick-start`
2) add `mainWindow.setAspectRatio(16/9)`

Result:
![may-04-2016 22-43-17](https://cloud.githubusercontent.com/assets/313152/15027045/40944fba-124a-11e6-8528-472d956d2317.gif)
- Electron version: 0.37.8
- Operating system: OS X 10.11.3

atom/browser/native_window_mac.h
gfx::Size ContentSizeToWindowSize(const gfx::Size& size) override;
  gfx::Size WindowSizeToContentSize(const gfx::Size& size) override;
  void UpdateDraggableRegions(
      const std::vector<DraggableRegion>& regions) override;
  void InstallView();
  void UninstallView();
  
  
  void UpdateDraggableRegionViews(const std::vector<DraggableRegion>& regions);
  base::scoped_nsobject<AtomNSWindow> window_;
  base::scoped_nsobject<AtomNSWindowDelegate> window_delegate_;
  
  id wheel_event_monitor_;
  
  base::scoped_nsobject<FullSizeContentView> content_view_;
  std::vector<DraggableRegion> draggable_regions_;
  bool is_kiosk_;
  NSInteger attention_request_id_;  
  
  NSApplicationPresentationOptions kiosk_options_;
  
  bool force_show_buttons_;
  
  bool should_hide_native_toolbar_in_fullscreen_;
  DISALLOW_COPY_AND_ASSIGN(NativeWindowMac);
};
}  
#endif