Use a uniform opaque type to represent web contents modal dialogs

chrome/chrome_browser_ui.gypi

 # Copyright 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_ui',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 1144 matching lines @@
         'browser/ui/intents/web_intent_picker_model.cc',
         'browser/ui/intents/web_intent_picker_model.h',
         'browser/ui/intents/web_intent_picker_model_observer.h',
         'browser/ui/login/login_model.h',
         'browser/ui/login/login_prompt.cc',
         'browser/ui/login/login_prompt.h',
         'browser/ui/media_stream_infobar_delegate.h',
         'browser/ui/media_stream_infobar_delegate.cc',
         'browser/ui/metro_pin_tab_helper_win.cc',
         'browser/ui/metro_pin_tab_helper_win.h',
+        'browser/ui/native_web_contents_modal_dialog.h',
         'browser/ui/native_web_contents_modal_dialog_manager.h',
         'browser/ui/network_profile_bubble.cc',
         'browser/ui/network_profile_bubble.h',
         'browser/ui/ntp_background_util.cc',
         'browser/ui/ntp_background_util.h',
         'browser/ui/omnibox/alternate_nav_infobar_delegate.cc',
         'browser/ui/omnibox/alternate_nav_infobar_delegate.h',
         'browser/ui/omnibox/alternate_nav_url_fetcher.cc',
         'browser/ui/omnibox/alternate_nav_url_fetcher.h',
         'browser/ui/omnibox/location_bar.h',
@@ skipping 1626 matching lines @@
         }],
         ['enable_message_center==1', {
           'dependencies': [
             '../ui/message_center/message_center.gyp:message_center',
           ],
         }],
       ],
     },
   ],
 }