URLRequestHttpJob::StartTransaction should honour network delegate.

net/url_request/url_request_http_job.h

 // 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.
 
 #ifndef NET_URL_REQUEST_URL_REQUEST_HTTP_JOB_H_
 #define NET_URL_REQUEST_URL_REQUEST_HTTP_JOB_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 149 matching lines @@
 
   virtual void UpdatePacketReadTimes() OVERRIDE;
   void RecordPacketStats(FilterContext::StatisticSelector statistic) const;
 
   void RecordCompressionHistograms();
   bool IsCompressibleContent() const;
 
   // Starts the transaction if extensions using the webrequest API do not
   // object.
   void StartTransaction();
+  // If |result| is net::OK, calls StartTransactionInternal. Otherwise notifies
+  // cancellation.
+  void MaybeStartTransactionInternal(int result);
   void StartTransactionInternal();
 
   void RecordPerfHistograms(CompletionCause reason);
   void DoneWithRequest(CompletionCause reason);
 
   // Callback functions for Cookie Monster
   void DoLoadCookies();
   void CheckCookiePolicyAndLoad(const CookieList& cookie_list);
   void OnCookiesLoaded(
       const std::string& cookie_line,
@@ skipping 77 matching lines @@
   // result of, if any.  If this request has not been retried, must be 0.
   // Reset once it's been used to log histograms.
   int error_before_retry_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestHttpJob);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_HTTP_JOB_H_