Remove unneeded JNI registrations.

base/android/important_file_writer_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 "base/android/important_file_writer_android.h"
-
 #include <string>
 
 #include "base/android/jni_string.h"
 #include "base/files/important_file_writer.h"
 #include "base/threading/thread_restrictions.h"
 #include "jni/ImportantFileWriterAndroid_jni.h"
 
 namespace base {
 namespace android {
 
@@ skipping 10 matching lines @@
   int data_length = env->GetArrayLength(data);
   jbyte* native_data = env->GetByteArrayElements(data, NULL);
   std::string native_data_string(reinterpret_cast<char *>(native_data),
                                  data_length);
   bool result = base::ImportantFileWriter::WriteFileAtomically(
       path, native_data_string);
   env->ReleaseByteArrayElements(data, native_data, JNI_ABORT);
   return result;
 }
 
-bool RegisterImportantFileWriterAndroid(JNIEnv* env) {
-  return RegisterNativesImpl(env);
-}
-
 }  // namespace android
 }  // namespace base