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.h
observers_.AddObserver(obs);
  }
  void RemoveObserver(NativeWindowObserver* obs) {
    observers_.RemoveObserver(obs);
  }
  brightray::InspectableWebContents* inspectable_web_contents() const {
    return inspectable_web_contents_;
  }
  bool has_frame() const { return has_frame_; }
  void set_has_frame(bool has_frame) { has_frame_ = has_frame; }
  bool transparent() const { return transparent_; }
  SkRegion* draggable_region() const { return draggable_region_.get(); }
  bool enable_larger_than_screen() const { return enable_larger_than_screen_; }
  void set_has_dialog_attached(bool has_dialog_attached) {
    has_dialog_attached_ = has_dialog_attached;
  }
 protected:
  NativeWindow(brightray::InspectableWebContents* inspectable_web_contents,
               const mate::Dictionary& options);
  
  
  scoped_ptr<SkRegion> DraggableRegionsToSkRegion(
      const std::vector<DraggableRegion>& regions);
  
  virtual gfx::Size ContentSizeToWindowSize(const gfx::Size& size) = 0;
  virtual gfx::Size WindowSizeToContentSize(const gfx::Size& size) = 0;
  
  virtual void UpdateDraggableRegions(