postmessage forwarding

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38165 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
revert unwanted changes

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@38166 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e