Remove oak windows and its flags.

ash/ash.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
   },
   'includes': [
@@ skipping 16 matching lines @@
         '../third_party/icu/icu.gyp:icuuc',
         '../ui/app_list/app_list.gyp:app_list',
         '../ui/aura/aura.gyp:aura',
         '../ui/base/strings/ui_strings.gyp:ui_strings',
         '../ui/compositor/compositor.gyp:compositor',
         '../ui/events/events.gyp:events',
         '../ui/gfx/gfx.gyp:gfx',
         '../ui/gfx/gfx.gyp:gfx_geometry',
         '../ui/keyboard/keyboard.gyp:keyboard',
         '../ui/message_center/message_center.gyp:message_center',
-        '../ui/oak/oak.gyp:oak',
         '../ui/resources/ui_resources.gyp:ui_resources',
         '../ui/ui.gyp:ui',
         '../ui/views/controls/webview/webview.gyp:webview',
         '../ui/views/views.gyp:views',
         '../ui/web_dialogs/web_dialogs.gyp:web_dialogs',
         '../ui/wm/wm.gyp:wm_public',
         '../url/url.gyp:url_lib',
         'ash_strings.gyp:ash_strings',
         'ash_resources',
       ],
@@ skipping 1065 matching lines @@
             },
           },
           'dependencies': [
             '../sandbox/sandbox.gyp:sandbox',
           ],
         }],
       ],
     },
   ],
 }