Move AppWindowContentsImpl to extensions

extensions/extensions.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 412 matching lines @@
         'browser/api/usb/usb_device_resource.h',
         'browser/api/usb_private/usb_private_api.cc',
         'browser/api/usb_private/usb_private_api.h',
         'browser/api_activity_monitor.h',
         'browser/app_sorting.h',
         'browser/app_window/app_delegate.h',
         'browser/app_window/app_web_contents_helper.cc',
         'browser/app_window/app_web_contents_helper.h',
         'browser/app_window/app_window.cc',
         'browser/app_window/app_window.h',
+        'browser/app_window/app_window_contents.cc',
+        'browser/app_window/app_window_contents.h',
         'browser/app_window/app_window_geometry_cache.cc',
         'browser/app_window/app_window_geometry_cache.h',
         'browser/app_window/app_window_registry.cc',
         'browser/app_window/app_window_registry.h',
         'browser/app_window/apps_client.cc',
         'browser/app_window/apps_client.h',
         'browser/app_window/native_app_window.h',
         'browser/app_window/size_constraints.cc',
         'browser/app_window/size_constraints.h',
         'browser/blacklist_state.h',
@@ skipping 600 matching lines @@
           'browser/api/cast_channel/logging.proto'
       ],
       'variables': {
           'proto_in_dir': 'browser/api/cast_channel',
           'proto_out_dir': 'extensions/browser/api/cast_channel',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ]
 }