- Electron version: `0.37.4`
- Operating system: Windows

When I maximize my [frameless](https://github.com/electron/electron/blob/master/docs/api/frameless-window.md) electron window a small part of the window in an unmaximized state is visible on a secondary monitor.

**Screenshot**
![electronbug](https://cloud.githubusercontent.com/assets/6634592/14762341/8849c728-09bb-11e6-85d8-de12db3fee2d.PNG)

You can visibly see the "line between the monitors" and you can see some really strange overhanging content that is over that line.

**Steps to reproduce**  
1. Open an electron app
2. Maximize the app on your secondary display
3. Look closely for the overflow onto your primary display

This might take a few times to trigger, it appears to do it about 70% of the time :confused: 

atom/browser/native_window_views.cc
menu_bar_alt_pressed_ = false;
    SetMenuBarVisibility(!menu_bar_visible_);
  } else {
    
    menu_bar_alt_pressed_ = false;
  }
}
void NativeWindowViews::Layout() {
#if defined(OS_WIN)
  
  
  if (!has_frame() && IsMaximized()) {
    gfx::Rect bounds = SubtractBorderSize(GetContentsBounds());
    web_view_->SetBoundsRect(bounds);
    return;
  }
#endif
  const auto size = GetContentsBounds().size();
  const auto menu_bar_bounds =
      menu_bar_ ? gfx::Rect(0, 0, size.width(), kMenuBarHeight) : gfx::Rect();
  if (menu_bar_) {
    menu_bar_->SetBoundsRect(menu_bar_bounds);
  }
  const auto old_web_view_size = web_view_ ? web_view_->size() : gfx::Size();
  if (web_view_) {
    web_view_->SetBoundsRect(
        gfx::Rect(0, menu_bar_bounds.height(), size.width(),
                  size.height() - menu_bar_bounds.height()));
  }