Explicitly whitelist the test server port.

net/test/test_server.cc

Index: net/test/test_server.cc
diff --git a/net/test/test_server.cc b/net/test/test_server.cc
index d2d3fdee6a44d1281faed61051b8051420a83ce5..a6e5a82972df359f97d459b7d62d0334466ff78e 100644
--- a/net/test/test_server.cc
+++ b/net/test/test_server.cc
@@ -159,6 +159,8 @@ bool TestServer::Start() {
     return false;
   }
 
+  allowed_port_.reset(new ScopedPortException(host_port_pair_.port()));
+
   started_ = true;
   return true;
 }
@@ -181,6 +183,8 @@ bool TestServer::Stop() {
     VLOG(1) << "Kill failed?";
   }
 
+  allowed_port_.reset();
+
   return ret;
 }