Remove ShowDesktopNotificationHostMsgParams in favor of PlatformNotificationData.

content/public/common/platform_notification_data.cc

Index: content/public/common/platform_notification_data.cc
diff --git a/content/public/common/platform_notification_data.cc b/content/public/common/platform_notification_data.cc
new file mode 100644
index 0000000000000000000000000000000000000000..46341bda3e477a886adefb58e48b4301afa28338
--- /dev/null
+++ b/content/public/common/platform_notification_data.cc
@@ -0,0 +1,14 @@
+// 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.
+
+#include "content/public/common/platform_notification_data.h"
+
+namespace content {
+
+PlatformNotificationData::PlatformNotificationData()
+    : direction(NotificationDirectionLeftToRight) {}
+
+PlatformNotificationData::~PlatformNotificationData() {}
+
+}  // namespace content