Adds a new error for cases where a firewall may be the issue.

net/socket/tcp_client_socket_win.cc

Index: net/socket/tcp_client_socket_win.cc
===================================================================
--- net/socket/tcp_client_socket_win.cc	(revision 63512)
+++ net/socket/tcp_client_socket_win.cc	(working copy)
@@ -64,8 +64,6 @@
   // There are numerous Winsock error codes, but these are the ones we thus far
   // find interesting.
   switch (os_error) {
-    // connect fails with WSAEACCES when Windows Firewall blocks the
-    // connection.
     case WSAEACCES:
       return ERR_ACCESS_DENIED;
     case WSAENETDOWN:
@@ -104,6 +102,10 @@
 
 int MapConnectError(int os_error) {
   switch (os_error) {
+    // connect fails with WSAEACCES when Windows Firewall blocks the
+    // connection.
+    case WSAEACCES:
+      return ERR_NETWORK_ACCESS_DENIED;
     case WSAETIMEDOUT:
       return ERR_CONNECTION_TIMED_OUT;
     default: {