Scrub ozone files from linux GN build

ash/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")
 
 gypi_values = exec_script(
     "//build/gypi_to_gn.py",
     [ rebase_path("ash.gyp") ],
@@ skipping 90 matching lines @@
       "system/tray/media_security/multi_profile_media_tray_item.h",
     ]
   }
 
   if (!use_x11 || !is_chromeos) {
     sources -= [
       "touch/touch_transformer_controller.cc",
       "touch/touch_transformer_controller.h",
     ]
   }
+
+  if (!use_ozone) {
+    sources -= [
+      "host/ash_window_tree_host_ozone.cc",
+    ]
+  }
 }
 
 component("ash_with_content") {
   sources = [
     "content_support/ash_with_content_export.h",
     "content_support/gpu_support_impl.cc",
     "content_support/gpu_support_impl.h",
     "screensaver/screensaver_view.cc",
     "screensaver/screensaver_view.h",
     "keyboard_overlay/keyboard_overlay_delegate.cc",
@@ skipping 234 matching lines @@
     #'../components/components.gyp:user_manager',  TODO(GYP)
     #'../content/content_shell_and_tests.gyp:test_support_content',  TODO(GYP)
   ]
 
   if (is_chromeos) {
     deps += [ "//ui/display" ]
   }
 }
 
 }  # if false