  v8::Local<v8::Value> FindFrameByRoutingId(v8::Isolate* isolate,
                                            int routing_id) {
    content::RenderFrame* render_frame =
        content::RenderFrame::FromRoutingID(routing_id);
    if (render_frame)
      return WebFrameRenderer::Create(isolate, render_frame).ToV8();
    else
      return v8::Null(isolate);
  }
  v8::Local<v8::Value> FindFrameByRoutingId(v8::Isolate* isolate,
                                            int routing_id) {
    content::RenderFrame* render_frame =
        content::RenderFrame::FromRoutingID(routing_id);
    if (render_frame)
      return WebFrameRenderer::Create(isolate, render_frame).ToV8();
    else
      return v8::Null(isolate);
  }