Remove unused import

task #299: Migrate to HtmlUnit 
http://github.com/jpschewe/fll-sw/issues/issue/299
Migrate TestAJAXBrackets to HtmlUnit

task #299: Migrate to HtmlUnit 
http://github.com/jpschewe/fll-sw/issues/issue/299
httpunit shouldn't be needed anymore

task #299: Migrate to HtmlUnit 
http://github.com/jpschewe/fll-sw/issues/issue/299