* Output of `node_modules/.bin/electron --version`: 2.0.12
* Operating System (Platform and Version): macOS 10.14

**Expected Behavior**
When having a window in simple fullscreen and you change display metrics or change from 1 monitor to 2 the window should size according to the new dimensions.

**Actual behavior**
The window size does not change when display metrics change.

**To Reproduce**
* Run Fiddle: https://gist.github.com/bpasero/e4013ea83033a8c231f58f94c0df57c3
* Change display metrics or change monitor count

=> the window is wrongly sized now and needs a transition from normal back to fullscreen to recover.
shell/browser/native_window.h
views::View* content_view() const { return content_view_; }
  bool has_frame() const { return has_frame_; }
  void set_has_frame(bool has_frame) { has_frame_ = has_frame; }
  bool transparent() const { return transparent_; }
  bool enable_larger_than_screen() const { return enable_larger_than_screen_; }
  NativeWindow* parent() const { return parent_; }
  bool is_modal() const { return is_modal_; }
  std::list<NativeBrowserView*> browser_views() const { return browser_views_; }
  int32_t window_id() const { return next_id_; }
 protected:
  NativeWindow(const gin_helper::Dictionary& options, NativeWindow* parent);
  
  views::Widget* GetWidget() override;
  const views::Widget* GetWidget() const override;
  base::string16 GetAccessibleWindowTitle() const override;
  void set_content_view(views::View* view) { content_view_ = view; }
  void add_browser_view(NativeBrowserView* browser_view) {
    browser_views_.push_back(browser_view);
  }
  void remove_browser_view(NativeBrowserView* browser_view) {
    browser_views_.remove_if(
        [&browser_view](NativeBrowserView* n) { return (n == browser_view); });
  }
 private:
  std::unique_ptr<views::Widget> widget_;
  static int32_t next_id_;
  
  views::View* content_view_ = nullptr;
  
  bool has_frame_ = true;