win ninja: build fix for msvs_pre/postbuild error test

test/msvs/buildevents/gyptest-ninja-warnings.py

 #!/usr/bin/env python
 
-# Copyright (c) 2011 Google Inc. All rights reserved.
+# Copyright (c) 2014 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
-Verifies that ninja warns about msvs_prebuild/msvs_postbuild.
+Verifies that ninja errors out when encountering msvs_prebuild/msvs_postbuild.
 """
 
 import sys
+import TestCmd
 import TestGyp
 
 
 if sys.platform == 'win32':
   test = TestGyp.TestGyp(formats=['ninja'])
 
-  test.run_gyp('buildevents.gyp')
+  test.run_gyp('buildevents.gyp',
+      status=1,
+      stderr='.*msvs_prebuild not supported \(target main\).*',
+      match=TestCmd.match_re_dotall)
 
-  test.must_contain_all_lines(test.stdout(),
-    ['Warning: msvs_prebuild not supported, dropping. (target main)',
-     'Warning: msvs_postbuild not supported, dropping. (target main)'])
+  test.run_gyp('buildevents.gyp',
+      status=1,
+      stderr='.*msvs_postbuild not supported \(target main\).*',
+      match=TestCmd.match_re_dotall)
 
   test.pass_test()