Avoid unneeded refcount bump on disk_cache::File

net/disk_cache/blockfile/file_posix.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/disk_cache/blockfile/file.h"
 
 #include <stdint.h>
 #include <limits>
 #include <utility>
 
@@ skipping 79 matching lines @@
     return Read(buffer, buffer_len, offset);
   }
 
   if (buffer_len > static_cast<size_t>(std::numeric_limits<int32_t>::max()) ||
       offset > static_cast<size_t>(std::numeric_limits<int32_t>::max())) {
     return false;
   }
 
   base::PostTaskAndReplyWithResult(
       s_worker_pool.Pointer(), FROM_HERE,
-      base::Bind(&File::DoRead, this, buffer, buffer_len, offset),
+      base::Bind(&File::DoRead, base::Unretained(this), buffer, buffer_len,
+                 offset),
       base::Bind(&File::OnOperationComplete, this, callback));
 
   *completed = false;
   return true;
 }
 
 bool File::Write(const void* buffer, size_t buffer_len, size_t offset,
                  FileIOCallback* callback, bool* completed) {
   DCHECK(base_file_.IsValid());
   if (!callback) {
     if (completed)
       *completed = true;
     return Write(buffer, buffer_len, offset);
   }
 
   if (buffer_len > static_cast<size_t>(std::numeric_limits<int32_t>::max()) ||
       offset > static_cast<size_t>(std::numeric_limits<int32_t>::max())) {
     return false;
   }
 
   base::PostTaskAndReplyWithResult(
       s_worker_pool.Pointer(), FROM_HERE,
-      base::Bind(&File::DoWrite, this, buffer, buffer_len, offset),
+      base::Bind(&File::DoWrite, base::Unretained(this), buffer, buffer_len,
+                 offset),
       base::Bind(&File::OnOperationComplete, this, callback));
 
   *completed = false;
   return true;
 }
 
 bool File::SetLength(size_t length) {
   DCHECK(base_file_.IsValid());
   if (length > std::numeric_limits<uint32_t>::max())
     return false;
@@ skipping 50 matching lines @@
   return net::ERR_CACHE_WRITE_FAILURE;
 }
 
 // This method actually makes sure that the last reference to the file doesn't
 // go away on the worker pool.
 void File::OnOperationComplete(FileIOCallback* callback, int result) {
   callback->OnFileIOComplete(result);
 }
 
 }  // namespace disk_cache