Revert r165772: Keep browser process alive while there are platform apps with background pages runn…

chrome/browser/extensions/platform_app_service.cc

Index: chrome/browser/extensions/platform_app_service.cc
===================================================================
--- chrome/browser/extensions/platform_app_service.cc	(revision 166679)
+++ chrome/browser/extensions/platform_app_service.cc	(working copy)
@@ -1,39 +0,0 @@
-// Copyright (c) 2012 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 "chrome/browser/extensions/platform_app_service.h"
-
-#include "chrome/browser/extensions/extension_host.h"
-#include "chrome/common/chrome_notification_types.h"
-#include "chrome/common/extensions/extension.h"
-#include "content/public/browser/browser_context.h"
-#include "content/public/browser/notification_details.h"
-#include "content/public/browser/notification_service.h"
-#include "content/public/browser/notification_types.h"
-
-namespace extensions {
-
-PlatformAppService::PlatformAppService(Profile* profile) {
-  registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_HOST_CREATED,
-                 content::Source<content::BrowserContext>(profile));
-}
-
-PlatformAppService::~PlatformAppService() {}
-
-void PlatformAppService::Observe(int type,
-                                  const content::NotificationSource& source,
-                                  const content::NotificationDetails& details) {
-  switch (type) {
-    case chrome::NOTIFICATION_EXTENSION_HOST_CREATED: {
-      ExtensionHost* host = content::Details<ExtensionHost>(details).ptr();
-      if (host->extension()->is_platform_app())
-        host->SetKeepsBrowserProcessAlive();
-      break;
-    }
-    default:
-      NOTREACHED();
-    }
-}
-
-}  // namespace extensions