make use of existing gn args in ui build config

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/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//ui/ozone/ozone.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
 if (is_ios) {
   import("//ios/build/config.gni")
@@ skipping 123 matching lines @@
     ":gesture_detection",
     "//base/third_party/dynamic_annotations",
     "//skia",
     "//ui/display",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 
   if (use_x11) {
     sources += [ "x/events_x.cc" ]
-    configs += [
-      "//build/config/linux:glib",
-      "//build/config/linux:x11",
-    ]
+    configs += [ "//build/config/linux:x11" ]
     deps += [
       "//ui/events/devices",
       "//ui/events/devices/x11",
       "//ui/events/x",
       "//ui/gfx/x",
     ]
   }
 
+  if (use_glib) {
+    configs += [ "//build/config/linux:glib" ]
+  }
+
   if (use_ozone || (is_android && use_aura)) {
     sources += [ "events_default.cc" ]
   }
 
   if (use_ozone) {
     sources += [
       "ozone/events_ozone.cc",
       "ozone/events_ozone.h",
     ]
     deps += [ "//ui/events/ozone:events_ozone_layout" ]
@@ skipping 298 matching lines @@
   generate_jar_jni("motionevent_jni_headers") {
     jni_package = "ui"
     classes = [ "android/view/MotionEvent.class" ]
   }
 
   generate_jar_jni("keyevent_jni_headers") {
     jni_package = "ui"
     classes = [ "android/view/KeyEvent.class" ]
   }
 }