Revert 149888 - Copy aura::Event into ui::Event.

ui/ui.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,
   },
   'includes': [
     'ui_resources.gypi',
@@ skipping 132 matching lines @@
         'base/dragdrop/gtk_dnd_util.cc',
         'base/dragdrop/gtk_dnd_util.h',
         'base/dragdrop/os_exchange_data.cc',
         'base/dragdrop/os_exchange_data.h',
         'base/dragdrop/os_exchange_data_provider_aura.cc',
         'base/dragdrop/os_exchange_data_provider_aura.h',
         'base/dragdrop/os_exchange_data_provider_gtk.cc',
         'base/dragdrop/os_exchange_data_provider_gtk.h',
         'base/dragdrop/os_exchange_data_provider_win.cc',
         'base/dragdrop/os_exchange_data_provider_win.h',
-        'base/event.cc',
-        'base/event.h',
         'base/events.h',
         'base/gestures/gesture_configuration.cc',
         'base/gestures/gesture_configuration.h',
         'base/gestures/gesture_point.cc',
         'base/gestures/gesture_point.h',
         'base/gestures/gesture_recognizer.h',
         'base/gestures/gesture_recognizer_impl.cc',
         'base/gestures/gesture_recognizer_impl.h',
         'base/gestures/gesture_sequence.cc',
         'base/gestures/gesture_sequence.h',
@@ skipping 404 matching lines @@
               # 'sources/' rather than 'sources!'.
               'sources/': [
                 ['exclude', '^base/dragdrop/drag_drop_types_gtk.cc'],
                 ['exclude', '^base/dragdrop/drag_utils_gtk.cc'],
                 ['exclude', '^base/dragdrop/drag_utils.cc'],
                 ['exclude', '^base/dragdrop/drag_utils.h'],
                 ['exclude', '^base/dragdrop/os_exchange_data.cc'],
                 ['exclude', '^base/dragdrop/os_exchange_data.h'],
                 ['exclude', '^base/dragdrop/os_exchange_data_provider_gtk.cc'],
                 ['exclude', '^base/dragdrop/os_exchange_data_provider_gtk.h'],
-                ['exclude', '^base/event.cc'],
-                ['exclude', '^base/event.h'],
               ],
             }, {
               # Note: because of gyp predence rules this has to be defined as
               # 'sources/' rather than 'sources!'.
               'sources/': [
                 ['include', '^base/dragdrop/os_exchange_data.cc'],
               ],
             }],
           ],
         }],
@@ skipping 176 matching lines @@
   ],
   'conditions': [
     ['inside_chromium_build == 1 and OS != "ios"', {
       # TODO(ios): The ui tests do not compile yet on iOS.
       'includes': [
         'ui_unittests.gypi',
       ]},
     ],
   ],
 }