code: public com.google.api.ads.admanager.axis.v201811.AdUnitSize[] getAdUnitSizes() {
          return adUnitSizes;
      }
docs: Gets the adUnitSizes value for this AdUnit.
  
  @return adUnitSizes   * The permissible creative sizes that can be served inside this
  ad unit. This
  attribute is optional. This attribute replaces the
  {@code sizes}
  attribute.