[CrOS Tether] Move the DeviceStatus normalizer code from HostScanner into its own file.

chromeos/components/tether/BUILD.gn

Index: chromeos/components/tether/BUILD.gn
diff --git a/chromeos/components/tether/BUILD.gn b/chromeos/components/tether/BUILD.gn
index 7adcb37424e4a191972c76330893adaa2dd5216e..92961ad6f41f86abc1cb19836f51001ceb97400e 100644
--- a/chromeos/components/tether/BUILD.gn
+++ b/chromeos/components/tether/BUILD.gn
@@ -24,6 +24,8 @@ static_library("tether") {
     "connect_tethering_operation.h",
     "device_id_tether_network_guid_map.cc",
     "device_id_tether_network_guid_map.h",
+    "device_status_util.cc",
+    "device_status_util.h",
     "disconnect_tethering_operation.cc",
     "disconnect_tethering_operation.h",
     "host_scan_cache.cc",
@@ -139,6 +141,7 @@ source_set("unit_tests") {
     "ble_connection_manager_unittest.cc",
     "ble_scanner_unittest.cc",
     "connect_tethering_operation_unittest.cc",
+    "device_status_util_unittest.cc",
     "disconnect_tethering_operation_unittest.cc",
     "host_scan_cache_unittest.cc",
     "host_scan_device_prioritizer_unittest.cc",