Remove OS_CHROMEOS from ui/ash code

chrome/test/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/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/chrome_tests.gni")
@@ skipping 2156 matching lines @@
             "//chrome")
   }
   if (safe_browsing_mode == 1 && enable_extensions) {
     sources += [ "../browser/extensions/blacklist_unittest.cc" ]
   }
   if (enable_app_list) {
     sources += rebase_path(
             chrome_tests_unit_gypi_values.chrome_unit_tests_app_list_sources,
             ".",
             "//chrome")
-    if (is_mac) {
-      # This assumes the AppList is views-based but Mac only links browser parts
-      # for the Cocoa implementation."
-      sources -= [ "../browser/ui/app_list/app_list_shower_views_unittest.cc" ]
-    }
     deps += [ "//ui/app_list:test_support" ]
   }
   if (enable_app_list && is_chromeos) {
     sources += rebase_path(
             chrome_tests_unit_gypi_values.chrome_unit_tests_app_list_chromeos_sources,
             ".",
             "//chrome")
     deps += [ "//components/arc:arc_test_support" ]
   }
   if (enable_plugins && !enable_plugin_installation) {
@@ skipping 155 matching lines @@
 if (is_android) {
   android_library("unit_tests_java") {
     java_files = [ "android/unit_tests_apk/src/org/chromium/chrome/unit_tests_apk/ChromeNativeTestApplication.java" ]
     deps = [
       "//base:base_java",
       "//chrome/android:chrome_java",
       "//content/public/android:content_java",
     ]
   }
 }