Create a new chrome/browser/apps folder and move PlatformAppService there.

chrome/browser/extensions/platform_app_service.h

Index: chrome/browser/extensions/platform_app_service.h
diff --git a/chrome/browser/extensions/platform_app_service.h b/chrome/browser/extensions/platform_app_service.h
deleted file mode 100644
index 28a578dcc8686a69a4d1691acfc2a3b396365a46..0000000000000000000000000000000000000000
--- a/chrome/browser/extensions/platform_app_service.h
+++ /dev/null
@@ -1,35 +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.
-
-#ifndef CHROME_BROWSER_EXTENSIONS_PLATFORM_APP_SERVICE_H_
-#define CHROME_BROWSER_EXTENSIONS_PLATFORM_APP_SERVICE_H_
-
-#include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/profiles/profile_keyed_service.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
-
-namespace extensions {
-
-// The PlatformAppService provides services for platform apps, such as
-// keeping the browser process alive while they are running.
-// TODO(benwells): Merge functionality of ShellWindowRegistry into this class.
-class PlatformAppService : public ProfileKeyedService,
-                           public content::NotificationObserver {
- public:
-  explicit PlatformAppService(Profile* profile);
-  virtual ~PlatformAppService();
-
- private:
-  // content::NotificationObserver:
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
-
-  content::NotificationRegistrar registrar_;
-};
-
-}  // namespace extensions
-
-#endif  // CHROME_BROWSER_EXTENSIONS_PLATFORM_APP_SERVICE_H_