Move gn _run target generation into test().

ui/base/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/compiler/compiler.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
@@ skipping 643 matching lines @@
       "../android/java/src/org/chromium/ui/base/DeviceFormFactor.java",
       "../android/java/src/org/chromium/ui/base/LocalizationUtils.java",
       "../android/java/src/org/chromium/ui/base/ResourceBundle.java",
       "../android/java/src/org/chromium/ui/base/SelectFileDialog.java",
       "../android/java/src/org/chromium/ui/base/TouchDevice.java",
     ]
     jni_package = "base"
   }
 }
 
-#
-# TODO(GYP): Delete this after we've converted everything to GN.
-# The _run targets exist only for compatibility w/ GYP.
-group("ui_base_unittests_run") {
-  testonly = true
-  deps = [
-    ":ui_base_unittests",
-  ]
-}
-
 # GYP version: ui/base/ui_base_tests.gyp:ui_base_unittests
 test("ui_base_unittests") {
   sources = [
     "ios/cru_context_menu_controller_unittest.mm",
     "l10n/l10n_util_mac_unittest.mm",
     "l10n/l10n_util_unittest.cc",
     "l10n/l10n_util_win_unittest.cc",
     "l10n/time_format_unittest.cc",
     "layout_unittest.cc",
     "material_design/material_design_controller_unittest.cc",
@@ skipping 209 matching lines @@
   }
   if (is_mac) {
     data += [ "$root_out_dir/ui_unittests Framework.framework/" ]
 
     if (is_asan && symbol_level == 0) {
       data += [ "$root_out_dir/ui_base_unittests.dSYM/" ]
     }
   }
 }
 # TODO(GYP) Mac (ui_base_tests_bundle)