  double GetZoomFactor(v8::Isolate* isolate) {
    double zoom_level = GetZoomLevel(isolate);
    return blink::PageZoomLevelToZoomFactor(zoom_level);
  }
  double GetZoomFactor(v8::Isolate* isolate) {
    double zoom_level = GetZoomLevel(isolate);
    return blink::PageZoomLevelToZoomFactor(zoom_level);
  }