Revert of Fix SPDY error-handling if the connection gets closed just after use.

net/http/http_proxy_client_socket_pool.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/http/http_proxy_client_socket_pool.h"
 
 #include <algorithm>
 
 #include "base/compiler_specific.h"
 #include "base/time/time.h"
@@ skipping 297 matching lines @@
       spdy_pool->FindAvailableSession(key, net_log());
   // It's possible that a session to the proxy has recently been created
   if (spdy_session) {
     if (transport_socket_handle_.get()) {
       if (transport_socket_handle_->socket())
         transport_socket_handle_->socket()->Disconnect();
       transport_socket_handle_->Reset();
     }
   } else {
     // Create a session direct to the proxy itself
-    spdy_session =
-        spdy_pool->CreateAvailableSessionFromSocket(
-            key, transport_socket_handle_.Pass(),
-            net_log(), OK, /*using_ssl_*/ true);
-    DCHECK(spdy_session);
+    int rv = spdy_pool->CreateAvailableSessionFromSocket(
+        key, transport_socket_handle_.Pass(),
+        net_log(), OK, &spdy_session, /*using_ssl_*/ true);
+    if (rv < 0)
+      return rv;
   }
 
   next_state_ = STATE_SPDY_PROXY_CREATE_STREAM_COMPLETE;
   return spdy_stream_request_.StartRequest(SPDY_BIDIRECTIONAL_STREAM,
                                            spdy_session,
                                            params_->request_url(),
                                            priority(),
                                            spdy_session->net_log(),
                                            callback_);
 }
@@ skipping 201 matching lines @@
   base_.RemoveHigherLayeredPool(higher_pool);
 }
 
 bool HttpProxyClientSocketPool::CloseOneIdleConnection() {
   if (base_.CloseOneIdleSocket())
     return true;
   return base_.CloseOneIdleConnectionInHigherLayeredPool();
 }
 
 }  // namespace net