mash: Migrate //ash/system/toast to WM common types

ash/system/toast/toast_data.cc

-// Copyright 2016 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 "ash/system/toast/toast_data.h"
-
-#include <utility>
-
-namespace ash {
-
-ToastData::ToastData(std::string id,
-                     std::string text,
-                     int32_t duration_ms,
-                     std::string dismiss_text)
-    : id(std::move(id)),
-      text(std::move(text)),
-      duration_ms(duration_ms),
-      dismiss_text(std::move(dismiss_text)) {}
-
-ToastData::ToastData(const ToastData& other) = default;
-
-}  // namespace ash