[fsp] Simplify aborting logic.

chrome/browser/chromeos/file_system_provider/fake_provided_file_system.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/fake_provided_file_system.h"
 
 #include "base/message_loop/message_loop_proxy.h"
 #include "net/base/io_buffer.h"
 
 namespace chromeos {
@@ skipping 371 matching lines @@
 }
 
 AbortCallback FakeProvidedFileSystem::PostAbortableTask(
     const base::Closure& callback) {
   const int task_id = tracker_.PostTask(
       base::MessageLoopProxy::current().get(), FROM_HERE, callback);
   return base::Bind(
       &FakeProvidedFileSystem::Abort, weak_ptr_factory_.GetWeakPtr(), task_id);
 }
 
-void FakeProvidedFileSystem::Abort(
-    int task_id,
-    const storage::AsyncFileUtil::StatusCallback& callback) {
+void FakeProvidedFileSystem::Abort(int task_id) {
   tracker_.TryCancel(task_id);
-  callback.Run(base::File::FILE_OK);
 }
 
-void FakeProvidedFileSystem::AbortMany(
-    const std::vector<int>& task_ids,
-    const storage::AsyncFileUtil::StatusCallback& callback) {
+void FakeProvidedFileSystem::AbortMany(const std::vector<int>& task_ids) {
   for (size_t i = 0; i < task_ids.size(); ++i) {
     tracker_.TryCancel(task_ids[i]);
   }
-  callback.Run(base::File::FILE_OK);
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos