- Electron version: v1.3.3
- Operating system: OS X 10.11.6

v1.3.3 broke the detection of the `scroll-touch-begin` and `scroll-touch-end` events for me within a `webview`. It looks like the pull request #6754 caused this issue. v1.3.2 works as expected.

Behavior that I'm observing on v1.3.3:
- Most of the time, the `scroll-touch-*` events are not emitted when the cursor is on top of a `webview`.
- The `scroll-touch-*` events seem to be emitted _only once_ when the cursor is on a `webview` and on a scrollable element. The scrollable elements in my app have no native scrollbar set (they have the style `overflow: hidden;` set instead of `overflow: scroll;`). This is the case in which I need to receive the `scroll-touch-*` events.
- The `scroll-touch-*` events seem to work fine when the cursor is outside of the `webview` tag.

atom/browser/api/atom_api_window.cc
if (!window_->IsClosed())
    window_->CloseContents(nullptr);
  
  
  base::MessageLoop::current()->DeleteSoon(FROM_HERE, window_.release());
}
void Window::WillCloseWindow(bool* prevent_default) {
  *prevent_default = Emit("close");
}
void Window::WillDestroyNativeObject() {
  
  v8::Locker locker(isolate());
  v8::HandleScope handle_scope(isolate());
  for (v8::Local<v8::Value> value : child_windows_.Values(isolate())) {
    mate::Handle<Window> child;
    if (mate::ConvertFromV8(isolate(), value, &child))
      child->window_->CloseImmediately();
  }
}
void Window::OnWindowClosed() {