Android: Remove unneeded RegisterNatives() calls

base/android/java_runtime.cc

 // Copyright 2015 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 "base/android/java_runtime.h"
 
 #include "jni/Runtime_jni.h"
 
 namespace base {
 namespace android {
 
-bool JavaRuntime::Register(JNIEnv* env) {
-  return JNI_Runtime::RegisterNativesImpl(env);
-}
-
 void JavaRuntime::GetMemoryUsage(long* total_memory, long* free_memory) {
   JNIEnv* env = base::android::AttachCurrentThread();
   base::android::ScopedJavaLocalRef<jobject> runtime =
       JNI_Runtime::Java_Runtime_getRuntime(env);
   *total_memory = JNI_Runtime::Java_Runtime_totalMemory(env, runtime.obj());
   *free_memory = JNI_Runtime::Java_Runtime_freeMemory(env, runtime.obj());
 }
 
 }  // namespace android
 }  // namespace base