* Electron version: 1.4.14
* Operating system: Windows 8.1

### Expected behavior

A fullscreen transparent window should be transparent.

### Actual behavior

The window is not transparent (has a white background).

### How to reproduce

```
electron.app.on("ready", function () {
    var win = new BrowserWindow({
        show: true,
        frame: false,
        fullscreen: true,
        transparent: true
    });
});
```

Refs https://github.com/electron/electron/issues/8321#issuecomment-273615701


atom/browser/native_window_views.cc
#if defined(OS_WIN)
  if (!(::GetWindowLong(GetAcceleratedWidget(), GWL_STYLE) & WS_THICKFRAME)) {
    SetBounds(restore_bounds_, false);
    return;
  }
#endif
  window_->Restore();
}
bool NativeWindowViews::IsMaximized() {
  return window_->IsMaximized();
}
void NativeWindowViews::Minimize() {
  if (IsVisible())
    window_->Minimize();
  else
    window_->native_widget_private()->ShowWithWindowState(
        ui::SHOW_STATE_MINIMIZED);
}
void NativeWindowViews::Restore() {
  window_->Restore();
}
bool NativeWindowViews::IsMinimized() {
  return window_->IsMinimized();
}
void NativeWindowViews::SetFullScreen(bool fullscreen) {