Move gn _run target generation into test(). (RELAND)

ui/aura/BUILD.gn

 # Copyright 2014 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/ui.gni")
 import("//testing/test.gni")
 
 component("aura") {
   sources = [
     "../wm/public/activation_change_observer.cc",
@@ skipping 261 matching lines @@
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl",
   ]
 
   if (use_x11) {
     deps += [ "//ui/gfx/x" ]
   }
 }
 
-# TODO(GYP): Delete this after we've converted everything to GN.
-# The _run targets exist only for compatibility w/ GYP.
-group("aura_unittests_run") {
-  testonly = true
-  deps = [
-    ":aura_unittests",
-  ]
-}
-
 test("aura_unittests") {
   sources = [
     "gestures/gesture_recognizer_unittest.cc",
     "test/run_all_unittests.cc",
     "window_event_dispatcher_unittest.cc",
     "window_targeter_unittest.cc",
     "window_unittest.cc",
   ]
 
   deps = [
@@ skipping 11 matching lines @@
   ]
 
   if (is_linux) {
     deps += [ "//third_party/mesa" ]
   }
 
   data_deps = [
     "//third_party/mesa:osmesa",
   ]
 }