Lower PSAPI_VERSION to 1 to try to get Chrome launching again on < Windows 7 after r96592.

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 1736 matching lines @@
       },  # target_defaults
     }],  # OS=="mac"
     ['OS=="win"', {
       'target_defaults': {
         'defines': [
           '_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',
         ],
         'conditions': [
           ['component=="static_library"', {
             'defines': [
               '_HAS_EXCEPTIONS=0',
@@ skipping 190 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',
   },
 }