Update Windows version macros to Win 7

build/common.gypi

 # Copyright (c) 2011 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 2180 matching lines @@
               }],  # mac_real_dsym
             ],  # target_conditions
           }],  # (_type=="executable" or _type=="shared_library" or
                #  _type=="loadable_module") and mac_strip!=0
         ],  # target_conditions
       },  # target_defaults
     }],  # OS=="mac"
     ['OS=="win"', {
       'target_defaults': {
         'defines': [
-          '_WIN32_WINNT=0x0600',
-          'WINVER=0x0600',
+          '_WIN32_WINNT=0x0601',
+          'WINVER=0x0601',
           'WIN32',
           '_WINDOWS',
           'NOMINMAX',
           'PSAPI_VERSION=1',
           '_CRT_RAND_S',
           'CERT_CHAIN_PARA_HAS_EXTRA_FIELDS',
           'WIN32_LEAN_AND_MEAN',
           '_ATL_NO_OPENGL',
           '_HAS_TR1=0',
         ],
@@ skipping 204 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }