message: Tweak outline-iconset
diff: */
  import '@polymer/iron-iconset-svg/iron-iconset-svg.js';
  +import {html} from '@polymer/polymer/lib/utils/html-tag.js';
  -const $_documentContainer = document.createElement('template');
  -$_documentContainer.innerHTML = `<iron-iconset-svg name="outline-iconset" size="24">
  +const template = html`<iron-iconset-svg name="outline-iconset" size="24">
  <svg>
  <defs>
  <g id="outline">
  @@ -38,4 +38,4 @@ $_documentContainer.innerHTML = `<iron-iconset-svg name="outline-iconset" size="
  </svg>
  </iron-iconset-svg>`;
  -document.head.appendChild($_documentContainer.content);
  +document.head.appendChild(template.content);
  