Fix various issues in RedirectToFileResourceHandler.

content/browser/loader/temporary_file_stream.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 "content/browser/loader/temporary_file_stream.h"
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/files/file_util_proxy.h"
+#include "base/memory/ref_counted.h"
+#include "content/public/browser/browser_thread.h"
+#include "net/base/file_stream.h"
+#include "webkit/common/blob/shareable_file_reference.h"
+
+using webkit_blob::ShareableFileReference;
+
+namespace content {
+
+namespace {
+
+void DidCreateTemporaryFile(
+    const CreateTemporaryFileStreamCallback& callback,
+    base::File::Error error_code,
+    base::PassPlatformFile file_handle,
+    const base::FilePath& file_path) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  if (error_code != base::File::FILE_OK) {
+    callback.Run(error_code, scoped_ptr<net::FileStream>(), NULL);
+    return;
+  }
+
+  // Cancelled or not, create the deletable_file so the temporary is cleaned up.
+  scoped_refptr<ShareableFileReference> deletable_file =
+      ShareableFileReference::GetOrCreate(
+          file_path,
+          ShareableFileReference::DELETE_ON_FINAL_RELEASE,
+          BrowserThread::GetMessageLoopProxyForThread(
+              BrowserThread::FILE).get());
+
+  scoped_ptr<net::FileStream> file_stream(new net::FileStream(
+      file_handle.ReleaseValue(),
+      base::PLATFORM_FILE_WRITE | base::PLATFORM_FILE_ASYNC,
+      NULL));
+
+  callback.Run(error_code, file_stream.Pass(), deletable_file);
+}
+
+}  // namespace
+
+void CreateTemporaryFileStream(
+    const CreateTemporaryFileStreamCallback& callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  base::FileUtilProxy::CreateTemporary(
+      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE).get(),
+      base::PLATFORM_FILE_ASYNC,
+      base::Bind(&DidCreateTemporaryFile, callback));
+}
+
+}  // namespace content