Updated to match API changes in Beta3.

InvocationRegistration had a constructor called Registration. I wonder if
that was causing the compile error with beta2.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4104 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/as/com/threerings/presents/net/PingRequest.as

@@ -1,5 +1,7 @@
 package com.threerings.presents.net {
 
+import flash.utils.getTimer;
+
 import com.threerings.io.ObjectOutputStream;
 
 public class PingRequest extends UpstreamMessage
@@ -22,7 +24,7 @@ public class PingRequest extends UpstreamMessage
     // documentation inherited
     public override function writeObject (out :ObjectOutputStream) :void
     {
-        _packStamp = flash.util.getTimer();
+        _packStamp = getTimer();
         super.writeObject(out);
     }