Remove sandbox on Windows.

content/content_app.gypi

 # 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.
 
 {
   'include_dirs': [
     '..',
   ],
   'dependencies': [
     '../base/base.gyp:base',
@@ skipping 38 matching lines @@
       ],
       'dependencies': [
         'content.gyp:content_jni_headers',
         '../build/android/ndk.gyp:cpu_features',
         '../device/usb/usb.gyp:device_usb',
         '../gpu/gpu.gyp:gpu_ipc_common',
         '../skia/skia.gyp:skia',
         '../ui/android/ui_android.gyp:ui_android',
       ],
     }],
-    ['OS=="win"', {
-      'dependencies': [
-        'content.gyp:sandbox_helper_win',
-      ],
-    }],
   ],
 }