Avoid setting a duplicate SpdySessionKey on a Request

net/http/http_stream_factory_impl_job.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_stream_factory_impl_job.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 772 matching lines @@
           spdy_session_key, net_log_);
   if (spdy_session && CanUseExistingSpdySession()) {
     // If we're preconnecting, but we already have a SpdySession, we don't
     // actually need to preconnect any sockets, so we're done.
     if (IsPreconnecting())
       return OK;
     using_spdy_ = true;
     next_state_ = STATE_CREATE_STREAM;
     existing_spdy_session_ = spdy_session;
     return OK;
-  } else if (request_ && (using_ssl_ || ShouldForceSpdyWithoutSSL())) {
+  } else if (request_ && !request_->HasSpdySessionKey() &&
+             (using_ssl_ || ShouldForceSpdyWithoutSSL())) {
     // Update the spdy session key for the request that launched this job.
     request_->SetSpdySessionKey(spdy_session_key);
   }
 
   // OK, there's no available SPDY session. Let |waiting_job_| resume if it's
   // paused.
 
   if (waiting_job_) {
     waiting_job_->Resume(this);
     waiting_job_ = NULL;
@@ skipping 668 matching lines @@
 
   if (job_status_ == STATUS_SUCCEEDED && other_job_status_ == STATUS_BROKEN) {
     HistogramBrokenAlternateProtocolLocation(
         BROKEN_ALTERNATE_PROTOCOL_LOCATION_HTTP_STREAM_FACTORY_IMPL_JOB_MAIN);
     session_->http_server_properties()->SetBrokenAlternateProtocol(
         HostPortPair::FromURL(request_info_.url));
   }
 }
 
 }  // namespace net