Reland r113263 rebased after revert of r113249.

net/disk_cache/in_flight_backend_io.cc

 // Copyright (c) 2011 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/disk_cache/in_flight_backend_io.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "net/base/net_errors.h"
@@ skipping 366 matching lines @@
   PostOperation(operation);
 }
 
 void InFlightBackendIO::OpenNextEntry(void** iter, Entry** next_entry,
                                       OldCompletionCallback* callback) {
   scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback));
   operation->OpenNextEntry(iter, next_entry);
   PostOperation(operation);
 }
 
+void InFlightBackendIO::OpenNextEntry(void** iter, Entry** next_entry,
+                                      const net::CompletionCallback& callback) {
+  scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback));
+  operation->OpenNextEntry(iter, next_entry);
+  PostOperation(operation);
+}
+
 void InFlightBackendIO::OpenPrevEntry(void** iter, Entry** prev_entry,
                                       OldCompletionCallback* callback) {
   scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, callback));
   operation->OpenPrevEntry(iter, prev_entry);
   PostOperation(operation);
 }
 
 void InFlightBackendIO::EndEnumeration(void* iterator) {
   scoped_refptr<BackendIO> operation(new BackendIO(this, backend_, NULL));
   operation->EndEnumeration(iterator);
@@ skipping 102 matching lines @@
     op->callback().Run(op->result());
 }
 
 void InFlightBackendIO::PostOperation(BackendIO* operation) {
   background_thread_->PostTask(FROM_HERE,
       base::Bind(&BackendIO::ExecuteOperation, operation));
   OnOperationPosted(operation);
 }
 
 }  // namespace