Remove some code inside USE_AURA and OS_WIN ifdefs.

content/content_child.gypi

 # Copyright 2013 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base',
     '../components/tracing.gyp:tracing',
     '../skia/skia.gyp:skia',
     '../ui/gfx/gfx.gyp:gfx',
@@ skipping 176 matching lines @@
         '../third_party/npapi/npapi.gyp:npapi',
         '../webkit/child/webkit_child.gyp:webkit_child',
         '../webkit/common/webkit_common.gyp:webkit_common',
       ],
     }],
     ['use_aura==1', {
       'sources!': [
         'child/npapi/webplugin_delegate_impl_mac.mm',
       ],
     }],
-    ['use_aura==1 and OS=="win"', {
+    ['OS=="win"', {
       'sources!': [
         'child/npapi/webplugin_delegate_impl_aura.cc',
       ],
     }],
   ],
 }