[fsp] Cleanup handling errors for operation requests.

chrome/browser/chromeos/file_system_provider/operations/read_file.cc

 // Copyright 2014 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 "chrome/browser/chromeos/file_system_provider/operations/read_file.h"
 
 #include <limits>
 #include <string>
 
 #include "chrome/common/extensions/api/file_system_provider.h"
@@ skipping 66 matching lines @@
                          bool has_more) {
   const int copy_result = CopyRequestValueToBuffer(
       result.Pass(), buffer_, current_offset_, length_);
   DCHECK_LE(0, copy_result);
   DCHECK(!has_more || copy_result > 0);
   if (copy_result > 0)
     current_offset_ += copy_result;
   callback_.Run(copy_result, has_more, base::File::FILE_OK);
 }
 
-void ReadFile::OnError(int /* request_id */, base::File::Error error) {
+void ReadFile::OnError(int /* request_id */,
+                       scoped_ptr<RequestValue> /* result */,
+                       base::File::Error error) {
   callback_.Run(0 /* chunk_length */, false /* has_more */, error);
 }
 
 }  // namespace operations
 }  // namespace file_system_provider
 }  // namespace chromeos