RenderWidget popup should be a NSWindow so it can go outside the main window.

content/content_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.
 
 {
   'variables': {
     'conditions': [
       ['chromeos==1', {
         'use_libgps%': 1,
       }, { # chromeos==0
@@ skipping 67 matching lines @@
     'public/browser/download_interrupt_reason_values.h',
     'public/browser/download_interrupt_reasons.h',
     'public/browser/download_item.h',
     'public/browser/download_manager.h',
     'public/browser/download_manager_delegate.cc',
     'public/browser/download_manager_delegate.h',
     'public/browser/download_save_info.cc',
     'public/browser/download_save_info.h',
     'public/browser/download_url_parameters.cc',
     'public/browser/download_url_parameters.h',
+    'public/browser/event_hook_application_mac.mm',
+    'public/browser/event_hook_application_mac.h',
     'public/browser/favicon_status.cc',
     'public/browser/favicon_status.h',
     'public/browser/file_descriptor_info.h',
     'public/browser/font_list_async.h',
     'public/browser/geolocation.h',
     'public/browser/geolocation_permission_context.h',
     'public/browser/global_request_id.h',
     'public/browser/gpu_data_manager.h',
     'public/browser/gpu_data_manager_observer.h',
     'public/browser/histogram_fetcher.h',
@@ skipping 1067 matching lines @@
       # the USE_LIBGPS setting propagates to the "real" dependent target,
       # we use all_dependent_settings here.
       'all_dependent_settings': {
         'defines': [
           'USE_LIBGPS',
         ],
       },
     }],
   ],
 }