[DeviceService] Move PowerMonitor interfaces, client lib, impl to live in Device Service

device/power_monitor/public/interfaces/BUILD.gn

Index: device/power_monitor/public/interfaces/BUILD.gn
diff --git a/device/power_monitor/public/interfaces/BUILD.gn b/device/power_monitor/public/interfaces/BUILD.gn
deleted file mode 100644
index 4dc40ef0efcdb8528207a970f7f2aa944dbd30b6..0000000000000000000000000000000000000000
--- a/device/power_monitor/public/interfaces/BUILD.gn
+++ /dev/null
@@ -1,11 +0,0 @@
-# Copyright 2016 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("//mojo/public/tools/bindings/mojom.gni")
-
-mojom("interfaces") {
-  sources = [
-    "power_monitor.mojom",
-  ]
-}