Move gn _run target generation into test().

ui/wm/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("wm") {
   sources = [
     "core/accelerator_delegate.h",
@@ skipping 89 matching lines @@
     "//skia",
     "//ui/aura",
     "//ui/aura:test_support",
     "//ui/base",
     "//ui/base/ime",
     "//ui/events",
     "//ui/events:events_base",
   ]
 }
 
-# TODO(GYP): Delete this after we've converted everything to GN.
-# The _run targets exist only for compatibility w/ GYP.
-group("wm_unittests_run") {
-  testonly = true
-  deps = [
-    ":wm_unittests",
-  ]
-}
-
 test("wm_unittests") {
   sources = [
     "core/capture_controller_unittest.cc",
     "core/compound_event_filter_unittest.cc",
     "core/cursor_manager_unittest.cc",
     "core/focus_controller_unittest.cc",
     "core/image_grid_unittest.cc",
     "core/shadow_controller_unittest.cc",
     "core/shadow_unittest.cc",
     "core/transient_window_manager_unittest.cc",
@@ skipping 20 matching lines @@
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl:test_support",
     "//ui/resources",
   ]
 
   data_deps = [
     "//ui/resources:ui_test_pak_data",
   ]
 }