Rewrite the Android implementation of BatteryMonitor directly in Java.

device/battery/android/battery_jni_registrar.cc

-// Copyright 2014 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 "device/battery/android/battery_jni_registrar.h"
-
-#include "base/android/jni_android.h"
-#include "base/android/jni_registrar.h"
-#include "device/battery/battery_status_manager_android.h"
-
-namespace device {
-namespace android {
-namespace {
-
-base::android::RegistrationMethod kRegisteredMethods[] = {
-    { "BatteryStatusManager", BatteryStatusManagerAndroid::Register },
-};
-
-}  // namespace
-
-bool RegisterBatteryJni(JNIEnv* env) {
-  return RegisterNativeMethods(
-      env, kRegisteredMethods, arraysize(kRegisteredMethods));
-}
-
-}  // namespace android
-}  // namespace device