mandoline filesystem: Rewrite using base::File.

components/filesystem/files_test_base.cc

 // Copyright 2015 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 "components/filesystem/files_test_base.h"
 
 #include "components/filesystem/public/interfaces/directory.mojom.h"
 #include "components/filesystem/public/interfaces/types.mojom.h"
 #include "mojo/application/public/cpp/application_impl.h"
 
 namespace filesystem {
 
 FilesTestBase::FilesTestBase() {
 }
 
 FilesTestBase::~FilesTestBase() {
 }
 
 void FilesTestBase::SetUp() {
   ApplicationTestBase::SetUp();
 
   mojo::URLRequestPtr request(mojo::URLRequest::New());
-  request->url = mojo::String::From("mojo:files");
+  request->url = mojo::String::From("mojo:filesystem");
   application_impl()->ConnectToService(request.Pass(), &files_);
 }
 
 void FilesTestBase::GetTemporaryRoot(DirectoryPtr* directory) {
-  Error error = ERROR_INTERNAL;
-  files()->OpenFileSystem(nullptr, GetProxy(directory), Capture(&error));
+  Error error = ERROR_FAILED;
+  files()->OpenFileSystem("temp", GetProxy(directory), Capture(&error));
   ASSERT_TRUE(files().WaitForIncomingResponse());
   ASSERT_EQ(ERROR_OK, error);
 }
 
 }  // namespace filesystem