Android: Remove unneeded RegisterNatives() calls

content/common/android/hash_set.cc

 // Copyright (c) 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 "jni/HashSet_jni.h"
 
 namespace content {
 
-bool RegisterHashSet(JNIEnv* env) {
-  return JNI_HashSet::RegisterNativesImpl(env);
-}
-
 void JNI_Java_HashSet_add(JNIEnv* env,
                           const base::android::JavaRef<jobject>& hash_set,
                           const base::android::JavaRef<jobject>& object) {
   JNI_HashSet::Java_HashSet_add(env, hash_set.obj(), object.obj());
 }
 
 void JNI_Java_HashSet_remove(JNIEnv* env,
                              const base::android::JavaRef<jobject>& hash_set,
                              const base::android::JavaRef<jobject>& object) {
   JNI_HashSet::Java_HashSet_remove(env, hash_set.obj(), object.obj());
 }
 
 void JNI_Java_HashSet_clear(JNIEnv* env,
                             const base::android::JavaRef<jobject>& hash_set) {
   JNI_HashSet::Java_HashSet_clear(env, hash_set.obj());
 }
 
 }  // namespace content