Rather than delaying datagrams if we've exceeded the throttle, just drop them.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@6137 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/presents/client/BlockingCommunicator.java

@@ -953,8 +953,13 @@ public class BlockingCommunicator extends Communicator
                 return;
             }
 
-            // make sure we're not exceeding our outgoing throttle rate
+            // if we're exceeding our outgoing throttle rate, drop the packet
-            throttleOutgoingMessage();
+            Throttle throttle = _client.getOutgoingMessageThrottle();
+            synchronized(throttle) {
+                if (throttle.throttleOp()) {
+                    return;
+                }
+            }
 
             try {
                 // write the message out the socket