Removing unnecessary code.

git-svn-id: https://google-web-toolkit.googlecode.com/svn/releases/1.6@4325 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/user/src/com/google/gwt/junit/JUnitShell.java b/user/src/com/google/gwt/junit/JUnitShell.java
index 5d68977..3fc8e80 100644
--- a/user/src/com/google/gwt/junit/JUnitShell.java
+++ b/user/src/com/google/gwt/junit/JUnitShell.java
@@ -397,11 +397,7 @@
       if (!unitTestShell.startUp()) {
         throw new JUnitFatalLaunchException("Shell failed to start");
       }
-      Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
-        public void run() {
-          unitTestShell.shutDown();
-        }
-      }));
+      // TODO: install a shutdown hook? Not necessary with GWTShell.
       unitTestShell.lastLaunchFailed = false;
     }