Move gn _run target generation into test().

device/BUILD.gn

 # Copyright 2015 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")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")  # For generate_jni().
 }
 
 if (is_mac) {
   import("//build/config/mac/mac_sdk.gni")
 }
 
 is_linux_without_udev = is_linux && !use_udev
 is_linux_without_dbus = is_linux && !use_dbus
 
-# TODO(GYP): Delete this after we've converted everything to GN.
-# The _run targets exist only for compatibility w/ GYP.
-group("device_unittests_run") {
-  testonly = true
-  deps = [
-    ":device_unittests",
-  ]
-}
-
 test("device_unittests") {
   sources = [
     "battery/battery_status_manager_win_unittest.cc",
     "battery/battery_status_service_unittest.cc",
     "bluetooth/bluetooth_adapter_mac_unittest.mm",
     "bluetooth/bluetooth_adapter_unittest.cc",
     "bluetooth/bluetooth_adapter_win_unittest.cc",
     "bluetooth/bluetooth_advertisement_unittest.cc",
     "bluetooth/bluetooth_device_unittest.cc",
     "bluetooth/bluetooth_device_win_unittest.cc",
@@ skipping 162 matching lines @@
   }
 
   android_library("bluetooth_test_java") {
     java_files = bluetooth_java_sources_needing_jni
     deps = [
       "//base:base_java",
       "//device/bluetooth:java",
     ]
   }
 }