Consolidate ui::NativeEvent and base::NativeEvent

base/base.gypi

 # Copyright (c) 2011 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 639 matching lines @@
         'linux_util.cc',
         'linux_util.h',
         'md5.cc',
         'md5.h',
         'message_pump_android.cc',
         'message_pump_android.h',
         'message_pump_glib.cc',
         'message_pump_glib.h',
         'message_pump_gtk.cc',
         'message_pump_gtk.h',
+        'message_pump_observer.h',
         'message_pump_x.cc',
         'message_pump_x.h',
         'message_pump_libevent.cc',
         'message_pump_libevent.h',
         'message_pump_mac.h',
         'message_pump_mac.mm',
         'message_pump_wayland.cc',
         'message_pump_wayland.h',
         'metrics/field_trial.cc',
         'metrics/field_trial.h',
@@ skipping 125 matching lines @@
             'third_party/xdg_mime/xdgmimemagic.c',
             'third_party/xdg_mime/xdgmimemagic.h',
             'third_party/xdg_mime/xdgmimeparent.c',
             'third_party/xdg_mime/xdgmimeparent.h',
           ],
         },
       ],
     }],
   ],
 }