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

services/device/BUILD.gn

Index: services/device/BUILD.gn
diff --git a/services/device/BUILD.gn b/services/device/BUILD.gn
index c3273655e92a9a79d2d90caabb04870aa30cb939..44681f244b74cc5bed41d9602eea817b838944f0 100644
--- a/services/device/BUILD.gn
+++ b/services/device/BUILD.gn
@@ -13,8 +13,8 @@ source_set("lib") {
 
   deps = [
     "//base",
-    "//device/power_monitor",
     "//device/time_zone_monitor",
+    "//services/device/power_monitor",
     "//services/service_manager/public/cpp",
   ]
 
@@ -26,6 +26,24 @@ source_set("lib") {
   ]
 }
 
+source_set("tests") {
+  testonly = true
+
+  sources = [
+    "power_monitor/power_monitor_message_broadcaster_unittest.cc",
+    "public/cpp/power_monitor/power_monitor_broadcast_source_unittest.cc",
+  ]
+
+  deps = [
+    "//base",
+    "//base/test:test_support",
+    "//mojo/public/cpp/bindings",
+    "//services/device/power_monitor",
+    "//services/device/public/cpp/power_monitor",
+    "//testing/gtest",
+  ]
+}
+
 service_manifest("manifest") {
   name = "device"
   source = "manifest.json"