Public (fhd@ubercode.de):

This patch adds a dedicated error message for the case that a
non-class type (e.g. an array) is passed to an UiHandler method.

Review by rjrjr
http://gwt-code-reviews.appspot.com/1382804/

Review by: robertvawter@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10468 8db76d5a-ed1c-0410-87a9-c151d255dfc7