Revert r1533035. A better solution is required.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1533046 13f79535-47bb-0310-9956-ffa450edef68
Use lazy init for the room in the WebSocket drawing board example.
This is primarily to avoid an issue with a hang on Java 6 in Tomcat 7 (the JSR-356 examples require Java 6) but may also help with adding multiple room support.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1533050 13f79535-47bb-0310-9956-ffa450edef68