Change mojo enums to be scoped enums in the generated C++ bindings.

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 <utility>
 
 #include "components/filesystem/public/interfaces/directory.mojom.h"
 #include "components/filesystem/public/interfaces/types.mojom.h"
@@ skipping 13 matching lines @@
   application_impl()->ConnectToService("mojo:filesystem", &files_);
 }
 
 void FilesTestBase::OnFileSystemShutdown() {
 }
 
 void FilesTestBase::GetTemporaryRoot(DirectoryPtr* directory) {
   filesystem::FileSystemClientPtr client;
   binding_.Bind(GetProxy(&client));
 
-  FileError error = FILE_ERROR_FAILED;
+  FileError error = FileError::FAILED;
   files()->OpenFileSystem("temp", GetProxy(directory), std::move(client),
                           mojo::Capture(&error));
   ASSERT_TRUE(files().WaitForIncomingResponse());
-  ASSERT_EQ(FILE_ERROR_OK, error);
+  ASSERT_EQ(FileError::OK, error);
 }
 
 }  // namespace filesystem