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* [x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
* [x] I have searched the issue tracker for an issue that matches the one I want to file, without success.

### Issue Details

* **Electron Version:** 6.0.0-beta.13
* **Operating System:** Windows 10

### Expected Behavior

When calling `browserWindow.setAlwaysOnTop(true)`, I expect the `always-on-top-changed` event to be called with the boolean `isAlwaysOnTop` parameter set to `true`, and vice versa.

### Actual Behavior

I experience the opposite of above: When calling `browserWindow.setAlwaysOnTop(true)`, my `always-on-top-changed` handler is called with `false`, and vice versa.

### To Reproduce

I don't have any JS code to share and I'm not a JS dev (I use F# and compile to JS with Fable). I think the issue should be easy to reproduce though.
shell/browser/native_window_views.cc
widget()->CenterWindow(GetSize());
}
void NativeWindowViews::Invalidate() {
  widget()->SchedulePaintInRect(gfx::Rect(GetBounds().size()));
}
void NativeWindowViews::SetTitle(const std::string& title) {
  title_ = title;
  widget()->UpdateWindowTitle();
}
std::string NativeWindowViews::GetTitle() {
  return title_;
}
void NativeWindowViews::FlashFrame(bool flash) {
#if defined(OS_WIN)
  
  if (!flash) {
    FLASHWINFO fwi;
    fwi.cbSize = sizeof(fwi);
    fwi.hwnd = GetAcceleratedWidget();
    fwi.dwFlags = FLASHW_STOP;
    fwi.uCount = 0;
    FlashWindowEx(&fwi);
    return;
  }
#endif
  widget()->FlashFrame(flash);
}
void NativeWindowViews::SetSkipTaskbar(bool skip) {