Revert of Replace Chrome IPC with Mojo IPC for querying BatteryStatus service

device/battery/battery_monitor.mojom

Index: device/battery/battery_monitor.mojom
diff --git a/device/battery/battery_monitor.mojom b/device/battery/battery_monitor.mojom
deleted file mode 100644
index 3648a745e3b29a69606367ed31ed97e9bff60951..0000000000000000000000000000000000000000
--- a/device/battery/battery_monitor.mojom
+++ /dev/null
@@ -1,18 +0,0 @@
-// 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 "device/battery/battery_status.mojom"
-
-module device {
-
-// A BatteryMonitor will periodically call its client's DidChange method.
-[Client=BatteryStatusObserver]
-interface BatteryMonitor {
-};
-
-interface BatteryStatusObserver {
-  DidChange(BatteryStatus status);
-};
-
-}