Moved CreateNativeAppWindow from AppWindow::Delegate to AppsClient.

apps/apps_client.h

-// Copyright 2013 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 APPS_APPS_CLIENT_H_
-#define APPS_APPS_CLIENT_H_
-
-#include <vector>
-
-namespace content {
-class BrowserContext;
-}
-
-namespace extensions {
-class Extension;
-}
-
-namespace apps {
-
-class AppWindow;
-
-// Sets up global state for the apps system. Should be Set() once in each
-// process. This should be implemented by the client of the apps system.
-class AppsClient {
- public:
-  // Get all loaded browser contexts.
-  virtual std::vector<content::BrowserContext*> GetLoadedBrowserContexts() = 0;
-
-  // Creates a new apps::AppWindow for the app in |extension| for |context|.
-  // Caller takes ownership.
-  virtual AppWindow* CreateAppWindow(
-      content::BrowserContext* context,
-      const extensions::Extension* extension) = 0;
-
-  // A positive keep-alive count is a request for the embedding application to
-  // keep running after all windows are closed. The count starts at zero.
-  virtual void IncrementKeepAliveCount() = 0;
-  virtual void DecrementKeepAliveCount() = 0;
-
-  // Return the apps client.
-  static AppsClient* Get();
-
-  // Initialize the apps system with this apps client.
-  static void Set(AppsClient* client);
-};
-
-}  // namespace apps
-
-#endif  // APPS_APPS_CLIENT_H_