Restructure the events target into two components:

ui/message_center/message_center.gyp

 # 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': {
     'chromium_code': 1,
   },
   'targets': [
     {
       'target_name': 'message_center',
       'type': '<(component)',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:base_i18n',
         '../../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
         '../../skia/skia.gyp:skia',
         '../../url/url.gyp:url_lib',
         '../base/strings/ui_strings.gyp:ui_strings',
-        '../events/events.gyp:events',
         '../gfx/gfx.gyp:gfx',
         '../ui.gyp:ui',
         '../ui.gyp:ui_resources',
       ],
       'defines': [
         'MESSAGE_CENTER_IMPLEMENTATION',
       ],
       'sources': [
         'cocoa/notification_controller.h',
         'cocoa/notification_controller.mm',
@@ skipping 61 matching lines @@
         'views/notification_view.cc',
         'views/notification_view.h',
         'views/toast_contents_view.cc',
         'views/toast_contents_view.h',
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [ 4267, ],
       'conditions': [
         ['toolkit_views==1', {
           'dependencies': [
+            '../events/events.gyp:events',
             '../views/views.gyp:views',
           ],
         }, {
           'sources/': [
             ['exclude', 'views/'],
           ],
         }],
         ['use_ash==0', {
           'sources!': [
             'views/message_bubble_base.cc',
@@ skipping 29 matching lines @@
         }],
       ],
     },  # target_name: message_center
     {
       'target_name': 'message_center_test_support',
       'type': 'static_library',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:test_support_base',
         '../../skia/skia.gyp:skia',
-        '../events/events.gyp:events',
         '../gfx/gfx.gyp:gfx',
         '../ui.gyp:ui',
         'message_center',
       ],
       'sources': [
         'fake_message_center.h',
         'fake_message_center.cc',
         'fake_notifier_settings_provider.h',
         'fake_notifier_settings_provider.cc',
       ],
     },  # target_name: message_center_test_support
     {
       'target_name': 'message_center_unittests',
       'type': 'executable',
       'dependencies': [
         '../../base/base.gyp:base',
         '../../base/base.gyp:test_support_base',
         '../../chrome/chrome_resources.gyp:packed_resources',
         '../../skia/skia.gyp:skia',
         '../../testing/gtest.gyp:gtest',
         '../../url/url.gyp:url_lib',
-        '../events/events.gyp:events',
         '../gfx/gfx.gyp:gfx',
         '../ui.gyp:ui',
         '../ui_unittests.gyp:run_ui_unittests',
         '../ui.gyp:ui_resources',
         '../../url/url.gyp:url_lib',
         'message_center',
         'message_center_test_support',
       ],
       'sources': [
         'cocoa/notification_controller_unittest.mm',
@@ skipping 44 matching lines @@
         # See http://crbug.com/162998#c4 for why this is needed.
         ['OS=="linux" and linux_use_tcmalloc==1', {
           'dependencies': [
             '../../base/allocator/allocator.gyp:allocator',
           ],
         }],
       ],
     },  # target_name: message_center_unittests
   ],
 }