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

device/power_monitor/BUILD.gn

Index: device/power_monitor/BUILD.gn
diff --git a/device/power_monitor/BUILD.gn b/device/power_monitor/BUILD.gn
deleted file mode 100644
index a799e01aad291c430bcb0353871ee08b096a7704..0000000000000000000000000000000000000000
--- a/device/power_monitor/BUILD.gn
+++ /dev/null
@@ -1,24 +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("//build/config/features.gni")
-
-component("power_monitor") {
-  sources = [
-    "power_monitor_export.h",
-    "power_monitor_message_broadcaster.cc",
-    "power_monitor_message_broadcaster.h",
-  ]
-
-  defines = [ "DEVICE_POWER_MONITOR_IMPLEMENTATION" ]
-
-  deps = [
-    "//base",
-    "//mojo/public/cpp/bindings",
-  ]
-
-  public_deps = [
-    "//device/power_monitor/public/interfaces",
-  ]
-}