[mojo-edk] Minor clean-up in the ports layer

mojo/edk/system/ports/event.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 "mojo/edk/system/ports/event.h"
+
+namespace mojo {
+namespace edk {
+namespace ports {
+
+namespace {
+
+const size_t kEventMessageAlignment = 8;
+
+}  // namespace
+
+static_assert(sizeof(PortDescriptor) % kEventMessageAlignment == 0,
+              "Invalid PordDescriptor size");
+static_assert(sizeof(EventHeader) % kEventMessageAlignment == 0,
+              "Invalid EventHeader size");
+static_assert(sizeof(UserEventData) % kEventMessageAlignment == 0,
+              "Invalid UserEventData size");
+static_assert(sizeof(ObserveProxyEventData) % kEventMessageAlignment == 0,
+              "Invalid ObserveProxyEventData size");
+static_assert(sizeof(ObserveProxyAckEventData) % kEventMessageAlignment == 0,
+              "Invalid ObserveProxyAckEventData size");
+static_assert(sizeof(ObserveClosureEventData) % kEventMessageAlignment == 0,
+              "Invalid ObserveClosureEventData size");
+
+PortDescriptor::PortDescriptor() {}
+
+PortDescriptor::~PortDescriptor() {}
+
+}  // namespace ports
+}  // namespace edk
+}  // namespace mojo