Fixes the cache lock issue.

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 163 matching lines @@
   HttpRequestInfo request_info_;
   const HttpResponseInfo* response_info_;
 
   // Auth states for proxy and origin server.
   AuthState proxy_auth_state_;
   AuthState server_auth_state_;
   AuthCredentials auth_credentials_;
 
   bool read_in_progress_;
 
+  // Always invoke Orphan on the transaction and never let it get destroyed
+  // implicitly.
   std::unique_ptr<HttpTransaction> transaction_;
 
   // This is used to supervise traffic and enforce exponential
   // back-off. May be NULL.
   scoped_refptr<URLRequestThrottlerEntryInterface> throttling_entry_;
 
   // A handle to the SDCH dictionaries that were advertised in this request.
   // May be null.
   std::unique_ptr<SdchManager::DictionarySet> dictionaries_advertised_;
 
@@ skipping 66 matching lines @@
   int64_t total_sent_bytes_from_previous_transactions_;
 
   base::WeakPtrFactory<URLRequestHttpJob> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(URLRequestHttpJob);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_URL_REQUEST_HTTP_JOB_H_