Move gn _run target generation into test().

ui/events/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")
 import("//ui/ozone/ozone.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
@@ skipping 315 matching lines @@
   }
 
   if (use_x11 || use_ozone) {
     sources += [ "test/device_data_manager_test_api_impl.cc" ]
     deps += [ "//ui/events/devices" ]
   } else {
     sources += [ "test/device_data_manager_test_api_stub.cc" ]
   }
 }
 
-# TODO(GYP): Delete this after we've converted everything to GN.
-# The _run targets exist only for compatibility w/ GYP.
-group("events_unittests_run") {
-  testonly = true
-  deps = [
-    ":events_unittests",
-  ]
-}
-
 test("events_unittests") {
   sources = [
     "android/scroller_unittest.cc",
     "cocoa/events_mac_unittest.mm",
     "event_dispatcher_unittest.cc",
     "event_processor_unittest.cc",
     "event_rewriter_unittest.cc",
     "event_unittest.cc",
     "gesture_detection/bitset_32_unittest.cc",
     "gesture_detection/filtered_gesture_provider_unittest.cc",
@@ skipping 101 matching lines @@
     sources += [ "android/motion_event_android_unittest.cc" ]
   }
 }
 
 if (is_android) {
   generate_jar_jni("motionevent_jni_headers") {
     jni_package = "ui"
     classes = [ "android/view/MotionEvent.class" ]
   }
 }