ApplicationConnection lifetime management changes.

mojo/application/public/cpp/lib/application_connection.cc

-// 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 "mojo/application/public/cpp/application_connection.h"
-
-#include "base/logging.h"
-
-namespace mojo {
-
-ApplicationConnection::ApplicationConnection() : connection_closed_(false) {
-}
-
-void ApplicationConnection::CloseConnection() {
-  if (connection_closed_)
-    return;
-  OnCloseConnection();
-  connection_closed_ = true;
-  delete this;
-}
-
-ApplicationConnection::~ApplicationConnection() {
-  // If this DCHECK fails then something has tried to delete this object without
-  // calling CloseConnection.
-  DCHECK(connection_closed_);
-}
-
-}  // namespace mojo