  void RemoveInsertedCSS(v8::Isolate* isolate, const std::u16string& key) {
    content::RenderFrame* render_frame;
    if (!MaybeGetRenderFrame(isolate, "removeInsertedCSS", &render_frame))
      return;

    blink::WebFrame* web_frame = render_frame->GetWebFrame();
    if (web_frame->IsWebLocalFrame()) {
      web_frame->ToWebLocalFrame()->GetDocument().RemoveInsertedStyleSheet(
          blink::WebString::FromUTF16(key));
    }
  }
  void RemoveInsertedCSS(v8::Isolate* isolate, const std::u16string& key) {
    content::RenderFrame* render_frame;
    if (!MaybeGetRenderFrame(isolate, "removeInsertedCSS", &render_frame))
      return;

    blink::WebFrame* web_frame = render_frame->GetWebFrame();
    if (web_frame->IsWebLocalFrame()) {
      web_frame->ToWebLocalFrame()->GetDocument().RemoveInsertedStyleSheet(
          blink::WebString::FromUTF16(key));
    }
  }