Also includes some other minor cleanup.
Fixes vaadin/framework8-issues#399 RemoveListenersDeprecatedTest test is fixed. Corrections are made to make the test above passes. Change-Id: I209a4693d241a1488b69b4742f48549dbf4bf0ac
Change-Id: I06d8e631448e419536dfbb9188a5934c6a7bad37
Change-Id: I4bc740154ffb5a30892b1859a7550a7aeff94fb3