* 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 void SetSimpleFullScreen(bool simple_fullscreen) = 0;
  virtual bool IsSimpleFullScreen() = 0;
  virtual void SetKiosk(bool kiosk) = 0;
  virtual bool IsKiosk() = 0;
  virtual bool IsTabletMode() const;
  virtual void SetBackgroundColor(SkColor color) = 0;
  virtual SkColor GetBackgroundColor() = 0;
  virtual void SetHasShadow(bool has_shadow) = 0;
  virtual bool HasShadow() = 0;
  virtual void SetOpacity(const double opacity) = 0;
  virtual double GetOpacity() = 0;
  virtual void SetRepresentedFilename(const std::string& filename);
  virtual std::string GetRepresentedFilename();
  virtual void SetDocumentEdited(bool edited);
  virtual bool IsDocumentEdited();
  virtual void SetIgnoreMouseEvents(bool ignore, bool forward) = 0;
  virtual void SetContentProtection(bool enable) = 0;
  virtual void SetFocusable(bool focusable);
  virtual void SetMenu(ElectronMenuModel* menu);
  virtual void SetParentWindow(NativeWindow* parent);
  virtual void AddBrowserView(NativeBrowserView* browser_view) = 0;
  virtual void RemoveBrowserView(NativeBrowserView* browser_view) = 0;
  virtual void SetTopBrowserView(NativeBrowserView* browser_view) = 0;
  virtual content::DesktopMediaID GetDesktopMediaID() const = 0;
  virtual gfx::NativeView GetNativeView() const = 0;
  virtual gfx::NativeWindow GetNativeWindow() const = 0;
  virtual gfx::AcceleratedWidget GetAcceleratedWidget() const = 0;
  virtual NativeWindowHandle GetNativeWindowHandle() const = 0;
  
  enum class ProgressState {