Extract NativeAppWindow from src/extensions

extensions/browser/app_window/app_window_client.h

 // 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.
 
 #ifndef EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_CLIENT_H_
 #define EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_CLIENT_H_
 
 #include "base/callback_forward.h"
-#include "extensions/browser/app_window/app_window.h"
 
 namespace content {
 class BrowserContext;
 class WebContents;
 }
 
+namespace native_app_window {
+class AppWindowCreateParams;
+class NativeAppWindow;
+}
+
 namespace extensions {
 
+class AppWindow;
 class Extension;
-class NativeAppWindow;
 
 // Sets up global state for the app window system. Should be Set() once in each
 // process. This should be implemented by the client of the app window system.
 // TODO(hashimoto): Move some functions to ExtensionsClient.
 class AppWindowClient {
  public:
   virtual ~AppWindowClient() {}
 
   // Creates a new AppWindow for the app in |extension| for |context|.
   // Caller takes ownership.
   virtual AppWindow* CreateAppWindow(content::BrowserContext* context,
                                      const Extension* extension) = 0;
 
   // Creates a new extensions::NativeAppWindow for |window|.
-  virtual NativeAppWindow* CreateNativeAppWindow(
+  virtual native_app_window::NativeAppWindow* CreateNativeAppWindow(
       AppWindow* window,
-      const AppWindow::CreateParams& params) = 0;
+      const native_app_window::AppWindowCreateParams& params) = 0;
 
   // Opens DevTools window and runs the callback.
   virtual void OpenDevToolsWindow(content::WebContents* web_contents,
                                   const base::Closure& callback) = 0;
 
   // Returns true if the current channel is older than dev.
   virtual bool IsCurrentChannelOlderThanDev() = 0;
 
   // Return the app window client.
   static AppWindowClient* Get();
 
   // Initialize the app window system with this app window client.
   static void Set(AppWindowClient* client);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_APP_WINDOW_APP_WINDOW_CLIENT_H_