document.importNode() is supported in Chrome.

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@9668 5f5364db-9458-4db8-a492-e30667be6df6
chrome progress

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@9669 5f5364db-9458-4db8-a492-e30667be6df6
IE11 progress

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@9670 5f5364db-9458-4db8-a492-e30667be6df6
Mandate Java 7 as a minimum requirement.

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@9671 5f5364db-9458-4db8-a492-e30667be6df6