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

device/power_monitor/public/cpp/BUILD.gn

Index: device/power_monitor/public/cpp/BUILD.gn
diff --git a/device/power_monitor/public/cpp/BUILD.gn b/device/power_monitor/public/cpp/BUILD.gn
deleted file mode 100644
index d586540b678491a529fbe7aa01cc9877e83e0406..0000000000000000000000000000000000000000
--- a/device/power_monitor/public/cpp/BUILD.gn
+++ /dev/null
@@ -1,22 +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")
-
-source_set("cpp") {
-  sources = [
-    "power_monitor_broadcast_source.cc",
-    "power_monitor_broadcast_source.h",
-  ]
-
-  deps = [
-    "//base",
-    "//mojo/public/cpp/bindings",
-    "//services/service_manager/public/cpp",
-  ]
-
-  public_deps = [
-    "//device/power_monitor/public/interfaces",
-  ]
-}