[DeviceService] Expose battery monitoring solely via the Device 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 c5c160090877c17798ad8e52f865e020a6a810f2..0000000000000000000000000000000000000000
--- a/device/battery/battery_monitor.mojom
+++ /dev/null
@@ -1,15 +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.
-
-module device.mojom;
-
-import "device/battery/battery_status.mojom";
-
-interface BatteryMonitor {
-  // Battery status is reported once it changes or immediately if this is the
-  // first call to QueryNextStatus on this instance. QueryNextStatus calls may
-  // be throttled by the service. Overlapping calls to QueryNextStatus are
-  // prohibited and will be treated as a connection error.
-  QueryNextStatus() => (BatteryStatus status);
-};