* Electron version: 1.6.0
* Operating system: MacOS 10.12.2

### Expected behavior

'scroll-touch-end' emits when trackpad scrolling ends.

### Actual behavior

The begin event emits, but not the end

### How to reproduce

Example repo: https://github.com/pfrazee/electron-bug-no-scroll-touch-end

atom/browser/native_window.cc
if (!inspectable_web_contents_)
    return;
  inspectable_web_contents_->GetView()->SetDelegate(nullptr);
  inspectable_web_contents_ = nullptr;
  Observe(nullptr);
  for (NativeWindowObserver& observer : observers_)
    observer.WillDestroyNativeObject();
  
  
  
  
  
  CloseImmediately();
  
  window_unresposive_closure_.Cancel();
}
void NativeWindow::RendererUnresponsive(content::WebContents* source) {