a283507bcc disabled EditIteratorTest due
to gwt-test-utils uncompatibility with new GWT 2.6 release.
After fixing the compatibility problem in [1] the tests can be enabled
again.
[1] https://github.com/gwt-test-utils/gwt-test-utils/issues/62
Change-Id: I1f93e6422a1ae60d66f4d8b4abac23b6a1acb4f9