Pulling in latest gyp with rule generation and configuration change....

build/common.gypi

 # Copyright (c) 2009 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': {
     # .gyp files should set chromium_code to 1 if they build Chromium-specific
@@ skipping 339 matching lines @@
        #   1 == /INCREMENTAL:NO
        #   2 == /INCREMENTAL
        # Debug links incremental, Release does not.
       'Common': {
         'abstract': 1,
         'msvs_configuration_attributes': {
           'OutputDirectory': '$(SolutionDir)$(ConfigurationName)',
           'IntermediateDirectory': '$(OutDir)\\obj\\$(ProjectName)',
           'CharacterSet': '1',
         },
-        'conditions': [
-          ['OS=="win"', {
-            'configuration_platform': 'Win32',
-          }],
-        ],
+        'msvs_configuration_platform': 'Win32',
       },
       'Debug': {
         'inherit_from': ['Common'],
         'xcode_settings': {
           'COPY_PHASE_STRIP': 'NO',
           'GCC_OPTIMIZATION_LEVEL': '<(mac_debug_optimization)',
           'OTHER_CFLAGS': [ '<@(debug_extra_cflags)', ],
         },
         'msvs_settings': {
           'VCCLCompilerTool': {
@@ skipping 533 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: