views: remove PlatformStyle combobox hooks

ui/views/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/base/ui_features.gni")
 import("//ui/ozone/ozone.gni")
 import("//ui/vector_icons/vector_icons.gni")
@@ skipping 10 matching lines @@
     "checkbox_normal.icon",
     "menu_check.1x.icon",
     "menu_check.icon",
     "menu_radio_empty.icon",
     "menu_radio_selected.icon",
     "radio_button_active.icon",
     "radio_button_normal.icon",
     "submenu_arrow.1x.icon",
     "submenu_arrow.icon",
   ]
-
-  if (is_mac) {
-    icons += [
-      "combobox_arrow_mac_enabled.icon",
-      "combobox_arrow_mac_disabled.icon",
-    ]
-  }
 }
 
 component("views") {
   all_dependent_configs = [ ":flags" ]
   sources = [
     "accessibility/native_view_accessibility.h",
     "accessible_pane_view.cc",
     "accessible_pane_view.h",
     "animation/bounds_animator.cc",
     "animation/bounds_animator.h",
@@ skipping 1029 matching lines @@
       "//ui/base:test_support",
       "//ui/compositor",
       "//ui/events:test_support",
       "//ui/gl:test_support",
       "//ui/resources",
       "//ui/resources:ui_test_pak",
       "//ui/strings",
     ]
   }
 }