Rewrite the Android implementation of BatteryMonitor directly in Java.

device/battery/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 component("battery") {
   output_name = "device_battery"
 
   sources = [
     "battery_export.h",
     "battery_monitor_impl.cc",
     "battery_monitor_impl.h",
-    "battery_status_manager_android.cc",
-    "battery_status_manager_android.h",
     "battery_status_manager_chromeos.cc",
     "battery_status_manager_default.cc",
     "battery_status_manager_linux.cc",
     "battery_status_manager_linux.h",
     "battery_status_manager_mac.cc",
     "battery_status_manager_win.cc",
     "battery_status_manager_win.h",
     "battery_status_service.cc",
     "battery_status_service.h",
   ]
 
   defines = [ "DEVICE_BATTERY_IMPLEMENTATION" ]
 
   deps = [
     ":mojo_bindings",
     "//base",
     "//base/third_party/dynamic_annotations",
     "//mojo/environment:chromium",
     "//mojo/public/cpp/bindings",
     "//mojo/edk/system",
   ]
 
-  if (is_android) {
-    deps += [ "//device/battery/android:battery_jni_headers" ]
-    sources += [
-      "android/battery_jni_registrar.h",
-      "android/battery_jni_registrar.cc",
-    ]
-    sources -= [ "battery_status_manager_default.cc" ]
-  }
-
   if (is_chromeos) {
     configs += [ "//build/config/linux:dbus" ]
     deps += [ "//chromeos:power_manager_proto" ]
     sources -= [
       "battery_status_manager_default.cc",
       "battery_status_manager_linux.cc",
     ]
   }
 
   if (is_desktop_linux) {
@@ skipping 14 matching lines @@
     sources -= [ "battery_status_manager_default.cc" ]
   }
 }
 
 mojom("mojo_bindings") {
   sources = [
     "battery_monitor.mojom",
     "battery_status.mojom",
   ]
 }