Explicitly whitelist the test server port.

chrome/test/live_sync/live_sync_test.cc

Index: chrome/test/live_sync/live_sync_test.cc
diff --git a/chrome/test/live_sync/live_sync_test.cc b/chrome/test/live_sync/live_sync_test.cc
index 6adba5c26ca466947096d45d59b40ce047a64bee..9c287d23c32f65ab4b962d6a400109ef42e54729 100644
--- a/chrome/test/live_sync/live_sync_test.cc
+++ b/chrome/test/live_sync/live_sync_test.cc
@@ -335,6 +335,7 @@ bool LiveSyncTest::SetUpLocalPythonTestServer() {
 
   net::HostPortPair xmpp_host_port_pair(sync_server_.host_port_pair());
   xmpp_host_port_pair.set_port(xmpp_port);
+  xmpp_port_.reset(new net::ScopedPortException(xmpp_port));
 
   if (!cl->HasSwitch(switches::kSyncNotificationHost)) {
     cl->AppendSwitchASCII(switches::kSyncNotificationHost,
@@ -379,6 +380,7 @@ bool LiveSyncTest::TearDownLocalPythonTestServer() {
     LOG(ERROR) << "Could not stop local python test server.";
     return false;
   }
+  xmpp_port_.reset();
   return true;
 }