Remove unnecessary assignment in transport_client_socket_unittest.cc.

net/socket/transport_client_socket_unittest.cc

Index: net/socket/transport_client_socket_unittest.cc
diff --git a/net/socket/transport_client_socket_unittest.cc b/net/socket/transport_client_socket_unittest.cc
index 36cc44ea369238e2b6346cdeaffeedc53948b535..59308c5a142ee72de9e4289d6ebc145a00224a93 100644
--- a/net/socket/transport_client_socket_unittest.cc
+++ b/net/socket/transport_client_socket_unittest.cc
@@ -103,7 +103,7 @@ void TransportClientSocketTest::SetUp() {
   ::testing::TestWithParam<ClientSocketTestTypes>::SetUp();
 
   // Find a free port to listen on
-  scoped_refptr<TCPListenSocket> sock = NULL;
+  scoped_refptr<TCPListenSocket> sock;
   int port;
   // Range of ports to listen on.  Shouldn't need to try many.
   const int kMinPort = 10100;