Remove OS_CHROMEOS from ui/ash code

chrome/browser/ui/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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
 
 gypi_values = exec_script("//build/gypi_to_gn.py",
@@ skipping 507 matching lines @@
 
   if (enable_app_list) {
     sources += rebase_path(gypi_values.chrome_browser_ui_app_list_sources,
                            ".",
                            "//chrome")
     if (is_chromeos) {
       sources += rebase_path(gypi_values.chrome_browser_ui_chromeos_arc_sources,
                              ".",
                              "//chrome")
     }
-    if (!is_mac) {
+    if (!is_mac && !use_ash) {
       sources +=
           rebase_path(gypi_values.chrome_browser_ui_app_list_views_sources,
                       ".",
                       "//chrome")
     }
     deps += [ "//ui/app_list" ]
   } else {
     sources += rebase_path(gypi_values.chrome_browser_ui_non_app_list_sources,
                            ".",
                            "//chrome")
@@ skipping 134 matching lines @@
     "//chrome/browser",
     "//content/public/browser",
     "//content/public/common",
     "//content/test:test_support",
     "//net:test_support",
     "//skia",
     "//testing/gtest",
     "//ui/base",
   ]
 }