Remove cygwin disease from grit (python) invocations :)

R=scottmg,joi
BUG=123026

Review URL: https://chromiumcodereview.appspot.com/10832121

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149892 0039d316-1c4b-4281-b951-d872f2087c98

build/grit_action.gypi

-# Copyright (c) 2011 The Chromium Authors. All rights reserved.
+# Copyright (c) 2012 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.
 
@@ -25,8 +25,11 @@
   ],
   'action': ['<@(grit_cmd)',
              '-i', '<(grit_grd_file)', 'build',
-             '-f', 'GRIT_DIR/../gritsettings/resource_ids',
+             # Combine the -f with the path to avoid gyp reinterpreting the path
+             # in terms of msvs' path structure.
+             '-fGRIT_DIR/../gritsettings/resource_ids',
              '-o', '<(grit_out_dir)',
              '<@(grit_defines)' ],
+  'msvs_cygwin_shell': 0,
   'message': 'Generating resources from <(grit_grd_file)',
 }