Move native_app_window code to apps areas

apps/native_app_window.h

Index: apps/native_app_window.h
diff --git a/chrome/browser/ui/extensions/native_app_window.h b/apps/native_app_window.h
similarity index 80%
rename from chrome/browser/ui/extensions/native_app_window.h
rename to apps/native_app_window.h
index 3e030f273b75141e2e4059f22006aea42269cd4f..81e6d5be7dc84cfde586604c83183bf6ba48b6c0 100644
--- a/chrome/browser/ui/extensions/native_app_window.h
+++ b/apps/native_app_window.h
@@ -2,25 +2,22 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_UI_EXTENSIONS_NATIVE_APP_WINDOW_H_
-#define CHROME_BROWSER_UI_EXTENSIONS_NATIVE_APP_WINDOW_H_
+#ifndef APPS_NATIVE_APP_WINDOW_H_
+#define APPS_NATIVE_APP_WINDOW_H_
 
 #include "apps/shell_window.h"
 #include "components/web_modal/web_contents_modal_dialog_host.h"
 #include "ui/base/base_window.h"
 #include "ui/gfx/insets.h"
 
+namespace apps {
+
 // This is an interface to a native implementation of a shell window, used for
 // new-style packaged apps. Shell windows contain a web contents, but no tabs
 // or URL bar.
 class NativeAppWindow : public ui::BaseWindow,
                         public web_modal::WebContentsModalDialogHost {
  public:
-  // Used by apps::ShellWindow to instantiate the platform-specific
-  // apps::ShellWindow code.
-  static NativeAppWindow* Create(apps::ShellWindow* window,
-                                 const apps::ShellWindow::CreateParams& params);
-
   // Called when the draggable regions are changed.
   virtual void UpdateDraggableRegions(
       const std::vector<extensions::DraggableRegion>& regions) = 0;
@@ -53,4 +50,6 @@ class NativeAppWindow : public ui::BaseWindow,
   virtual ~NativeAppWindow() {}
 };
 
-#endif  // CHROME_BROWSER_UI_EXTENSIONS_NATIVE_APP_WINDOW_H_
+}  // namespace apps
+
+#endif  // APPS_NATIVE_APP_WINDOW_H_