ui: Remove unneeded RegisterNatives() call on Android

ui/base/device_form_factor_android.cc

 // 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.
 
-#include "ui/base/device_form_factor_android.h"
+#include "ui/base/device_form_factor.h"
 
 #include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "jni/DeviceFormFactor_jni.h"
 
 namespace ui {
 
 DeviceFormFactor GetDeviceFormFactor() {
   bool is_tablet = Java_DeviceFormFactor_isTablet(
       base::android::AttachCurrentThread(),
       base::android::GetApplicationContext());
   return is_tablet ? DEVICE_FORM_FACTOR_TABLET : DEVICE_FORM_FACTOR_PHONE;
 }
 
-bool RegisterDeviceFormFactorAndroid(JNIEnv* env) {
-  return RegisterNativesImpl(env);
-}
-
 }  // namespace ui