Update to VS2013 Update 4, and Windows SDK 8.1

chrome/angle.isolate

 # 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.
 {
   'includes': [
     '../base/base.isolate',
   ],
   'conditions': [
     ['OS=="win"', {
       'variables': {
         'files': [
-          '<(PRODUCT_DIR)/d3dcompiler_46.dll',
+          '<(PRODUCT_DIR)/d3dcompiler_47.dll',
           '<(PRODUCT_DIR)/libEGL.dll',
           '<(PRODUCT_DIR)/libGLESv2.dll',
         ],
       },
     }],
   ],
 }