chromeos: Move files in //ash/common to //ash

ash/common/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/common/system/toast/toast_data.h"
-
-#include <utility>
-
-namespace ash {
-
-ToastData::ToastData(std::string id,
-                     const base::string16& text,
-                     int32_t duration_ms,
-                     const base::Optional<base::string16>& dismiss_text)
-    : id(std::move(id)),
-      text(text),
-      duration_ms(duration_ms),
-      dismiss_text(dismiss_text) {}
-
-ToastData::ToastData(const ToastData& other) = default;
-
-ToastData::~ToastData() = default;
-
-}  // namespace ash