Disk cache: Switch the disk cache to use the cache_thread....

net/http/http_cache.cc

 // Copyright (c) 2010 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_cache.h"
 
 #include <algorithm>
 
 #include "base/compiler_specific.h"
 
@@ skipping 884 matching lines @@
       // Anything after a Doom has to be restarted.
       fail_requests = true;
     } else if (item->IsValid()) {
       key = pending_op->disk_entry->GetKey();
       entry = ActivateEntry(key, pending_op->disk_entry);
     } else {
       // The writer transaction is gone.
       if (op == WI_CREATE_ENTRY)
         pending_op->disk_entry->Doom();
       pending_op->disk_entry->Close();
+      pending_op->disk_entry = NULL;
       fail_requests = true;
     }
   }
 
   // We are about to notify a bunch of transactions, and they may decide to
   // re-issue a request (or send a different one). If we don't delete
   // pending_op, the new request will be appended to the end of the list, and
   // we'll see it again from this point before it has a chance to complete (and
   // we'll be messing out the request order). The down side is that if for some
   // reason notifying request A ends up cancelling request B (for the same key),
@@ skipping 72 matching lines @@
     // This could be an external caller or a transaction waiting on Start().
     pending_item->DoCallback(result, temp_backend_);
     pending_item->NotifyTransaction(result, NULL);
   }
 
   DeletePendingOp(pending_op);
   building_backend_ = false;
 }
 
 }  // namespace net