- 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
if (browser_view_) {
    web_view_->RemoveChildView(
        browser_view_->GetInspectableWebContentsView()->GetView());
    browser_view_ = nullptr;
  }
  if (!browser_view) {
    return;
  }
  
  
  browser_view_ = browser_view;
  web_view_->AddChildView(
      browser_view->GetInspectableWebContentsView()->GetView());
}
void NativeWindowViews::SetParentWindow(NativeWindow* parent) {