Don't use browser windows for platform app shell windows

chrome/chrome_browser.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 2947 matching lines @@
         'browser/ui/constrained_window.h',
         'browser/ui/constrained_window_tab_helper.cc',
         'browser/ui/constrained_window_tab_helper.h',
         'browser/ui/constrained_window_tab_helper_delegate.cc',
         'browser/ui/constrained_window_tab_helper_delegate.h',
         'browser/ui/crypto_module_password_dialog.cc',
         'browser/ui/crypto_module_password_dialog.h',
         'browser/ui/crypto_module_password_dialog_nss.cc',
         'browser/ui/crypto_module_password_dialog_openssl.cc',
         'browser/ui/dialog_style.h',
+        'browser/ui/extensions/shell_window.cc',
+        'browser/ui/extensions/shell_window.h',
         'browser/ui/find_bar/find_bar.h',
         'browser/ui/find_bar/find_bar_controller.cc',
         'browser/ui/find_bar/find_bar_controller.h',
         'browser/ui/find_bar/find_bar_state.cc',
         'browser/ui/find_bar/find_bar_state.h',
         'browser/ui/find_bar/find_notification_details.h',
         'browser/ui/find_bar/find_tab_helper.cc',
         'browser/ui/find_bar/find_tab_helper.h',
         'browser/ui/fullscreen_controller.cc',
         'browser/ui/fullscreen_controller.h',
@@ skipping 75 matching lines @@
         'browser/ui/gtk/edit_search_engine_dialog.cc',
         'browser/ui/gtk/edit_search_engine_dialog.h',
         'browser/ui/gtk/extensions/extension_install_dialog_gtk.cc',
         'browser/ui/gtk/extensions/extension_installed_bubble_gtk.cc',
         'browser/ui/gtk/extensions/extension_installed_bubble_gtk.h',
         'browser/ui/gtk/extensions/extension_popup_gtk.cc',
         'browser/ui/gtk/extensions/extension_popup_gtk.h',
         'browser/ui/gtk/extensions/extension_uninstall_dialog_gtk.cc',
         'browser/ui/gtk/extensions/extension_view_gtk.cc',
         'browser/ui/gtk/extensions/extension_view_gtk.h',
+        'browser/ui/gtk/extensions/shell_window_gtk.cc',
+        'browser/ui/gtk/extensions/shell_window_gtk.h',
         'browser/ui/gtk/external_protocol_dialog_gtk.cc',
         'browser/ui/gtk/external_protocol_dialog_gtk.h',
         'browser/ui/gtk/find_bar_gtk.cc',
         'browser/ui/gtk/find_bar_gtk.h',
         'browser/ui/gtk/first_run_bubble.cc',
         'browser/ui/gtk/first_run_bubble.h',
         'browser/ui/gtk/first_run_dialog.cc',
         'browser/ui/gtk/first_run_dialog.h',
         'browser/ui/gtk/fullscreen_exit_bubble_gtk.cc',
         'browser/ui/gtk/fullscreen_exit_bubble_gtk.h',
@@ skipping 2346 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/history/in_memory_url_index_cache.proto' ],
       'variables': {
         'proto_in_dir': 'browser/history',
         'proto_out_dir': 'chrome/browser/history',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }