Get rid of KeepAlive. Quit shell when all urls run directly by Context are closed.

mojo/shell/keep_alive.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/shell/keep_alive.h"
-
-#include "base/bind.h"
-#include "mojo/shell/context.h"
-
-namespace mojo {
-namespace shell {
-
-KeepAlive::KeepAlive(Context* context) : context_(context) {
-  DCHECK(context_->task_runners()->shell_runner()->RunsTasksOnCurrentThread());
-  ++context_->keep_alive_counter()->count_;
-}
-
-KeepAlive::~KeepAlive() {
-  DCHECK(context_->task_runners()->shell_runner()->RunsTasksOnCurrentThread());
-  if (--context_->keep_alive_counter()->count_ == 0) {
-    base::MessageLoop::current()->PostTask(
-        FROM_HERE,
-        base::Bind(&KeepAlive::MaybeQuit, context_));
-  }
-}
-
-// static
-void KeepAlive::MaybeQuit(Context* context) {
-  if (context->keep_alive_counter()->count_ == 0)
-    base::MessageLoop::current()->Quit();
-}
-
-}  // namespace shell
-}  // namespace mojo