populateLegacyFiles() {
    let name;
    for (name in this.vendorFiles) {
      let args = this.vendorFiles[name];

      if (args === null) {
        continue;
      }

      this.import.apply(this, [].concat(args));
    }
  }
Imports legacy imports in this.vendorFiles

    @private
    @method populateLegacyFiles