* 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
virtual gfx::Rect ContentBoundsToWindowBounds(
      const gfx::Rect& bounds) const = 0;
  virtual gfx::Rect WindowBoundsToContentBounds(
      const gfx::Rect& bounds) const = 0;
  base::WeakPtr<NativeWindow> GetWeakPtr() {
    return weak_factory_.GetWeakPtr();
  }
  
  virtual void HandleKeyboardEvent(
      content::WebContents*,
      const content::NativeWebKeyboardEvent& event) {}
  
  
  void NotifyWindowRequestPreferredWith(int* width);
  void NotifyWindowCloseButtonClicked();
  void NotifyWindowClosed();
  void NotifyWindowEndSession();
  void NotifyWindowBlur();
  void NotifyWindowFocus();
  void NotifyWindowShow();
  void NotifyWindowIsKeyChanged(bool is_key);
  void NotifyWindowHide();
  void NotifyWindowMaximize();
  void NotifyWindowUnmaximize();
  void NotifyWindowMinimize();
  void NotifyWindowRestore();
  void NotifyWindowMove();