Move gn _run target generation into test().

ui/touch_selection/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")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
@@ skipping 50 matching lines @@
     "touch_selection_controller_test_api.cc",
     "touch_selection_controller_test_api.h",
   ]
 
   deps = [
     ":touch_selection",
     "//base:base",
   ]
 }
 
-# TODO(GYP): Delete this after we've converted everything to GN.
-# The _run targets exist only for compatibility w/ GYP.
-group("ui_touch_selection_unittests_run") {
-  testonly = true
-  deps = [
-    ":ui_touch_selection_unittests",
-  ]
-}
-
 test("ui_touch_selection_unittests") {
   sources = [
     "longpress_drag_selector_unittest.cc",
     "touch_handle_unittest.cc",
     "touch_selection_controller_unittest.cc",
   ]
 
   deps = [
     ":test_support",
     ":touch_selection",
@@ skipping 16 matching lines @@
     sources = [
       "selection_event_type.h",
     ]
   }
   java_cpp_enum("ui_touch_handle_orientation_srcjar") {
     sources = [
       "touch_handle_orientation.h",
     ]
   }
 }