Add SecureMessage definitions to CryptAuth.

components/proximity_auth/cryptauth/secure_message_delegate.cc

+// Copyright 2015 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 "components/proximity_auth/cryptauth/secure_message_delegate.h"
+
+namespace proximity_auth {
+
+SecureMessageDelegate::SecureMessageDelegate() {
+}
+
+SecureMessageDelegate::~SecureMessageDelegate() {
+}
+
+SecureMessageDelegate::CreateOptions::CreateOptions() {
+}
+
+SecureMessageDelegate::CreateOptions::~CreateOptions() {
+}
+
+SecureMessageDelegate::UnwrapOptions::UnwrapOptions() {
+}
+
+SecureMessageDelegate::UnwrapOptions::~UnwrapOptions() {
+}
+
+}  // proximity_auth