- 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/ui/win/atom_desktop_window_tree_host_win.cc
#include "atom/browser/ui/win/atom_desktop_window_tree_host_win.h"
#include "atom/browser/ui/win/message_handler_delegate.h"
namespace atom {
AtomDesktopWindowTreeHostWin::AtomDesktopWindowTreeHostWin(
    MessageHandlerDelegate* delegate,
    views::internal::NativeWidgetDelegate* native_widget_delegate,
    views::DesktopNativeWidgetAura* desktop_native_widget_aura)
        : views::DesktopWindowTreeHostWin(native_widget_delegate,
                                          desktop_native_widget_aura),
          delegate_(delegate) {
}
AtomDesktopWindowTreeHostWin::~AtomDesktopWindowTreeHostWin() {
}
bool AtomDesktopWindowTreeHostWin::PreHandleMSG(
    UINT message, WPARAM w_param, LPARAM l_param, LRESULT* result) {
  return delegate_->PreHandleMSG(message, w_param, l_param, result);
}
/** Override the client area inset
 *  Returning true forces a border of 0 for frameless windows
 */
bool AtomDesktopWindowTreeHostWin::GetClientAreaInsets(
    gfx::Insets* insets) const {
  return !HasFrame();
}
}