* 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
kNone,           
    kIndeterminate,  
    kError,          
    kPaused,         
    kNormal,         
  };
  virtual void SetProgressBar(double progress, const ProgressState state) = 0;
  virtual void SetOverlayIcon(const gfx::Image& overlay,
                              const std::string& description) = 0;
  
  virtual void SetVisibleOnAllWorkspaces(
      bool visible,
      bool visibleOnFullScreen = false,
      bool skipTransformProcessType = false) = 0;
  virtual bool IsVisibleOnAllWorkspaces() = 0;
  virtual void SetAutoHideCursor(bool auto_hide);
  
  virtual void SetVibrancy(const std::string& type);
  
#if defined(OS_MAC)
  virtual void SetWindowButtonVisibility(bool visible) = 0;