Android: Remove unneeded RegisterNatives() calls

components/web_restrictions/browser/mock_web_restrictions_client.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/web_restrictions/browser/mock_web_restrictions_client.h"
 
 #include "jni/MockWebRestrictionsClient_jni.h"
 
 namespace web_restrictions {
 
 MockWebRestrictionsClient::MockWebRestrictionsClient() {
   Java_MockWebRestrictionsClient_registerAsMockForTesting(
       base::android::AttachCurrentThread());
 }
 
 MockWebRestrictionsClient::~MockWebRestrictionsClient() {
   Java_MockWebRestrictionsClient_unregisterAsMockForTesting(
       base::android::AttachCurrentThread());
 }
 
-bool MockWebRestrictionsClient::Register(JNIEnv* env) {
-  return RegisterNativesImpl(env);
-}
-
 }  // namespace web_restrictions