message: Use the get/setTemplateContent method on TreeAdapter interface to access <template> content.
diff: */
  import * as clone from 'clone';
  import * as dom5 from 'dom5';
  -import {ASTNode, serialize} from 'parse5';
  +import {ASTNode, serialize, treeAdapters} from 'parse5';
  import {Analyzer, Document, FSUrlLoader} from 'polymer-analyzer';
  import * as astUtils from './ast-utils';
  @@ -370,11 +370,12 @@ export class Bundler {
  let template = dom5.query(domModule, matchers.template);
  if (!template) {
  template = dom5.constructors.element('template')!;
  - template['content'] = dom5.constructors.fragment();
  + treeAdapters.default.setTemplateContent(
  + template, dom5.constructors.fragment());
  astUtils.prepend(domModule, template);
  }
  astUtils.removeElementAndNewline(style);
  - astUtils.prepend(template['content'], style);
  + astUtils.prepend(treeAdapters.default.getTemplateContent(template), style);
  }
  /**
  