Handle error when user closes browser while playing snake game.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1528369 13f79535-47bb-0310-9956-ffa450edef68
Swallow exception when writing to a closed client

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1528383 13f79535-47bb-0310-9956-ffa450edef68