Use the system stdint.h on Windows in leveldatabase.

third_party/leveldatabase/leveldatabase.gyp

 # Copyright (c) 2011 The LevelDB Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file. See the AUTHORS file for names of contributors.
 
 {
   'variables': {
     'use_snappy%': 1,
   },
   'conditions': [
     ['OS == "android" and android_webview_build == 1', {
       'variables': {
         # Snappy not used in Android WebView
         # crbug.com/236780
         'use_snappy': 0,
       },
     }],
   ],
   'target_defaults': {
     'defines': [
       'LEVELDB_PLATFORM_CHROMIUM=1',
     ],
     'include_dirs': [
       '.',
       'src/',
       'src/include/',
     ],
     'conditions': [
-      ['OS == "win"', {
-        'include_dirs': [
-          'src/port/win',
-        ],
-      }],
       ['use_snappy', {
         'defines': [
           'USE_SNAPPY=1',
         ],
       }],
     ],
   },
   'targets': [
     {
       'target_name': 'leveldatabase',
@@ skipping 11 matching lines @@
             '../../third_party/snappy/snappy.gyp:snappy',
           ],
         }],
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           'src/include/',
           'src/',
           '.',
         ],
-        'conditions': [
-          ['OS == "win"', {
-            'include_dirs': [
-              'src/port/win',
-            ],
-          }],
-        ],
       },
       # Patch posted for upstream, can be removed once that's landed and
       # rolled into Chromium.
       # Internal link: https://mondrian.corp.google.com/#review/29997992
       'msvs_disabled_warnings': [
         # Signed/unsigned comparison.
         4018,
 
         # TODO(jschuh): http://crbug.com/167187 size_t -> int
         4267,
@@ skipping 296 matching lines @@
       ],
     },
   ],
 }
 
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 # indent-tabs-mode:nil
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