ui: Remove unneeded RegisterNatives() call on Android

ui/events/events.gyp

 # Copyright 2013 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': [
     {
@@ skipping 163 matching lines @@
             'events_stub.cc',
           ],
         }],
         ['use_ozone==1', {
           'dependencies': [
             'ozone/events_ozone.gyp:events_ozone_layout',
           ],
         }],
         ['OS=="android"', {
           'sources': [
-            'android/events_jni_registrar.cc',
-            'android/events_jni_registrar.h',
             'android/motion_event_android.cc',
             'android/motion_event_android.h',
             'android/key_event_utils.cc',
             'android/key_event_utils.h',
           ],
           'dependencies': [
             'motionevent_jni_headers',
             'keyevent_jni_headers',
           ],
         }],
@@ skipping 191 matching lines @@
           'variables': {
             'jni_gen_package': 'ui',
             'input_java_class': 'android/view/KeyEvent.class',
           },
           'includes': [ '../../build/jar_file_jni_generator.gypi' ],
         },
       ],
     }],
   ],
 }