Android: Remove unneeded RegisterNatives() calls

ui/events/android/key_event_utils.cc

 // Copyright 2016 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.
 
 #include "ui/events/android/key_event_utils.h"
 
 #include "jni/KeyEvent_jni.h"
 
 namespace ui {
 namespace events {
 namespace android {
 
-bool RegisterKeyEvent(JNIEnv* env) {
-  return JNI_KeyEvent::RegisterNativesImpl(env);
-}
-
 base::android::ScopedJavaLocalRef<jobject> CreateKeyEvent(JNIEnv* env,
                                                           int action,
                                                           int key_code) {
   return JNI_KeyEvent::Java_KeyEvent_ConstructorAVKE_I_I(env, action, key_code);
 }
 
 int GetKeyEventUnicodeChar(JNIEnv* env,
                            const base::android::JavaRef<jobject>& event,
                            int meta_state) {
   return static_cast<int>(JNI_KeyEvent::Java_KeyEvent_getUnicodeCharI_I(
       env, event.obj(), meta_state));
 }
 
 }  // namespace android
 }  // namespace events
 }  // namespace ui