Remove ShowDesktopNotificationHostMsgParams in favor of PlatformNotificationData.

content/child/notifications/notification_data_conversions.h

+// Copyright 2014 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.
+
+#ifndef CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_DATA_CONVERSIONS_H_
+#define CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_DATA_CONVERSIONS_H_
+
+#include "content/common/content_export.h"
+#include "content/public/common/platform_notification_data.h"
+#include "third_party/WebKit/public/platform/WebNotificationData.h"
+
+namespace content {
+
+// Converts Blink WebNotificationData to PlatformNotificationData.
+CONTENT_EXPORT PlatformNotificationData ToPlatformNotificationData(
+    const blink::WebNotificationData& web_data);
+
+// Converts PlatformNotificationData to Blink WebNotificationData.
+CONTENT_EXPORT blink::WebNotificationData ToWebNotificationData(
+    const PlatformNotificationData& platform_data);
+
+}  // namespace content
+
+#endif  // CONTENT_CHILD_NOTIFICATIONS_NOTIFICATION_DATA_CONVERSIONS_H_