Provide mechanism to suppress warning dialog when runtime and compile time user.agent propert values disagree, i.e. via <set-property name="user.agent.runtimeWarning" value="false"/> Fixes issues: 5861 Review at http://gwt-code-reviews.appspot.com/1344802 Review by: jat@google.com git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9701 8db76d5a-ed1c-0410-87a9-c151d255dfc7