2.1/user/src/com/google/gwt/core/CrossSiteIframeLinker.gwt.xml

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<!-- Defines the cross-site iframe linker   -->
<module>
  <define-linker name="xsiframe" class="com.google.gwt.core.linker.CrossSiteIframeLinker" />
  
  <replace-with class="com.google.gwt.core.client.impl.CrossSiteIframeLoadingStrategy">
    <when-type-is
      class="com.google.gwt.core.client.impl.AsyncFragmentLoader.LoadingStrategy" />
    <when-linker-added name="xsiframe" />
  </replace-with>
</module>