Remove ash_unittests/mash_unittests from Windows build targets

mash/BUILD.gn

 # Copyright 2015 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("//services/service_manager/public/service_manifest.gni")
 import("//testing/test.gni")
 
 # Target that builders build.
 group("all") {
   testonly = true
 
   deps = [
     "//components/leveldb",
     "//mash/catalog_viewer",
     "//mash/example",
     "//mash/init",
     "//mash/login",
     "//mash/screenlock",
     "//mash/session",
     "//mash/task_viewer",
   ]
 
   # Build on platforms that support ash.
-  if (is_win || is_chromeos) {
+  if (is_chromeos) {
     deps += [ "//mash:mash_unittests" ]
   }
 }
 
 group("browser") {
   testonly = true
 
   deps = [
     ":all",
     "//mash/browser",
@@ skipping 23 matching lines @@
   data_deps = [
     ":unittests_manifest",
     "//ash/mus:resources",
   ]
 }
 
 service_manifest("unittests_manifest") {
   name = "mash_unittests"
   source = "unittests_manifest.json"
 }