Make ConnectJob::ReleaseSocket() return NULL on connection error.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/150205

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@19819 0039d316-1c4b-4281-b951-d872f2087c98

net/socket/client_socket_pool_base.cc

@@ -307,6 +307,7 @@ void ClientSocketPoolBase::OnConnectJobComplete(int result, ConnectJob* job) {
   RemoveConnectJob(job->key_handle());
 
   if (result != OK) {
+    DCHECK(!socket.get());
     callback->Run(result);  // |group| is not necessarily valid after this.
     // |group| may be invalid after the callback, we need to search
     // |group_map_| again.

net/socket/client_socket_pool_base.h

@@ -52,7 +52,8 @@ class ConnectJob {
   LoadState load_state() const { return load_state_; }
   const ClientSocketHandle* key_handle() const { return key_handle_; }
 
-  // Releases |socket_| to the client.
+  // Releases |socket_| to the client.  On connection error, this should return
+  // NULL.
   ClientSocket* ReleaseSocket() { return socket_.release(); }
 
   // Begins connecting the socket.  Returns OK on success, ERR_IO_PENDING if it

net/socket/tcp_client_socket_pool.cc

@@ -114,6 +114,9 @@ int TCPConnectJob::DoTCPConnectComplete(int result) {
         base::TimeDelta::FromMilliseconds(1),
         base::TimeDelta::FromMinutes(10),
         100);
+  } else {
+    // Delete the socket on error.
+    set_socket(NULL);
   }
 
   return result;