Move message flags into a separate header that can be used

chrome/chrome.gyp

 # Copyright (c) 2009 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,
   },
   'includes': [
     '../build/common.gypi',
@@ skipping 191 matching lines @@
         'common/l10n_util_win.h',
         'common/libxml_utils.cc',
         'common/libxml_utils.h',
         'common/logging_chrome.cc',
         'common/logging_chrome.h',
         'common/mach_ipc_mac.h',
         'common/mach_ipc_mac.mm',
         'common/mach_message_source_mac.cc',
         'common/mach_message_source_mac.h',
         'common/main_function_params.h',
+        'common/message_box_flags.h',
         'common/message_router.cc',
         'common/message_router.h',
         'common/modal_dialog_event.h',
         'common/mru_cache.h',
         'common/navigation_types.h',
         'common/native_web_keyboard_event.h',
         'common/native_web_keyboard_event_linux.cc',
         'common/native_web_keyboard_event_mac.mm',
         'common/native_web_keyboard_event_win.cc',
         'common/notification_details.h',
@@ skipping 2528 matching lines @@
             'Debug': {
               'msvs_precompiled_header': 'tools/build/win/precompiled.h',
               'msvs_precompiled_source': 'tools/build/win/precompiled.cc',
             },
           },
         },
       ]},  # 'targets'
     ],  # OS=="win"
   ],  # 'conditions'
 }