Removing the WindowFocusListener because IE does not implement it in a way that is consistent with other browsers, and normalizing the behavoir would require sinking the onBlur event on every element on the page.

Patch by: jlabanca
Review by: ajr
Issue: 68



git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@3586 8db76d5a-ed1c-0410-87a9-c151d255dfc7