Revert "[NaCl SDK] Temporarily disable SocketTestTCP.Listen test under PNaCl"

This reverts commit bb6f7fd33e294c8422c12b31ca5a4514ef6d0171.
PNaCl changed was reverted, so this should work again.

BUG=377084
NOTRY=true
(naclsdk only)

Review URL: https://codereview.chromium.org/308683004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273664 0039d316-1c4b-4281-b951-d872f2087c98

native_client_sdk/src/tests/nacl_io_socket_test/socket_test.cc

@@ -584,15 +584,7 @@ TEST_F(SocketTestUDP, Listen) {
   EXPECT_EQ(errno, ENOTSUP);
 }
 
-// Temporarily disable the TCP Listen test on PNaCl;
-// TODO(sbc): Re-enable once we fix the issue: http://crbug/377084
-#ifdef __pnacl__
-#define MAYBE_Listen DISABLED_Listen
-#else
-#define MAYBE_Listen Listen
-#endif
-
-TEST_F(SocketTestTCP, MAYBE_Listen) {
+TEST_F(SocketTestTCP, Listen) {
   sockaddr_in addr;
   socklen_t addrlen = sizeof(addr);
   const char* client_greeting = "hello";