Remove some PlatformFile instances from ChromeOS Drive.

chrome/browser/chromeos/drive/file_system/truncate_operation.cc

 // Copyright 2013 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/drive/file_system/truncate_operation.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
+#include "base/files/file.h"
 #include "base/files/file_path.h"
-#include "base/files/scoped_platform_file_closer.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop_proxy.h"
-#include "base/platform_file.h"
 #include "base/sequenced_task_runner.h"
 #include "base/task_runner_util.h"
 #include "chrome/browser/chromeos/drive/drive.pb.h"
 #include "chrome/browser/chromeos/drive/file_cache.h"
 #include "chrome/browser/chromeos/drive/file_errors.h"
 #include "chrome/browser/chromeos/drive/file_system/download_operation.h"
 #include "chrome/browser/chromeos/drive/file_system/operation_observer.h"
 #include "chrome/browser/chromeos/drive/job_scheduler.h"
 #include "content/public/browser/browser_thread.h"
 
@@ skipping 11 matching lines @@
                                  const base::FilePath& local_cache_path,
                                  int64 length) {
   DCHECK(metadata);
   DCHECK(cache);
 
   scoped_ptr<base::ScopedClosureRunner> file_closer;
   FileError error = cache->OpenForWrite(local_id, &file_closer);
   if (error != FILE_ERROR_OK)
     return error;
 
-  base::PlatformFileError result = base::PLATFORM_FILE_ERROR_FAILED;
-  base::PlatformFile file = base::CreatePlatformFile(
-      local_cache_path,
-      base::PLATFORM_FILE_OPEN | base::PLATFORM_FILE_WRITE,
-      NULL,
-      &result);
-  if (result != base::PLATFORM_FILE_OK)
+  base::File file(local_cache_path,
+                  base::File::FLAG_OPEN | base::File::FLAG_WRITE);
+  if (!file.IsValid())
     return FILE_ERROR_FAILED;
 
-  DCHECK_NE(base::kInvalidPlatformFileValue, file);
-  base::ScopedPlatformFileCloser platform_file_closer(&file);
-
-  if (!base::TruncatePlatformFile(file, length))
+  if (!file.SetLength(length))
     return FILE_ERROR_FAILED;
 
   return FILE_ERROR_OK;
 }
 
 }  // namespace
 
 TruncateOperation::TruncateOperation(
     base::SequencedTaskRunner* blocking_task_runner,
     OperationObserver* observer,
@@ skipping 79 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!callback.is_null());
 
   observer_->OnEntryUpdatedByOperation(local_id);
 
   callback.Run(error);
 }
 
 }  // namespace file_system
 }  // namespace drive