Android: Remove unneeded RegisterNatives() calls

components/gcm_driver/instance_id/scoped_use_fake_instance_id_android.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 "components/gcm_driver/instance_id/scoped_use_fake_instance_id_android.h"
 
 #include "base/android/jni_android.h"
 #include "jni/FakeInstanceIDWithSubtype_jni.h"
 
 using base::android::AttachCurrentThread;
 
 namespace instance_id {
 
-// static
-bool ScopedUseFakeInstanceIDAndroid::RegisterJni(JNIEnv* env) {
-  return RegisterNativesImpl(env);
-}
-
 ScopedUseFakeInstanceIDAndroid::ScopedUseFakeInstanceIDAndroid() {
   JNIEnv* env = AttachCurrentThread();
   previous_value_ =
       Java_FakeInstanceIDWithSubtype_clearDataAndSetEnabled(env, true);
 }
 
 ScopedUseFakeInstanceIDAndroid::~ScopedUseFakeInstanceIDAndroid() {
   JNIEnv* env = AttachCurrentThread();
   Java_FakeInstanceIDWithSubtype_clearDataAndSetEnabled(env, previous_value_);
 }
 
 }  // namespace instance_id