Python 3 compatibility

test/mac/gyptest-app-error.py

 #!/usr/bin/env python
 
 # Copyright (c) 2012 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 invalid strings files cause the build to fail.
 """
 
+from __future__ import print_function
+
 import TestCmd
 import TestGyp
 
 import sys
 
 if sys.platform == 'darwin':
-  print "This test is currently disabled: https://crbug.com/483696."
+  print("This test is currently disabled: https://crbug.com/483696.")
   sys.exit(0)
 
   expected_error = 'Old-style plist parser: missing semicolon in dictionary'
   saw_expected_error = [False]  # Python2 has no "nonlocal" keyword.
   def match(a, b):
     if a == b:
       return True
     if not TestCmd.is_List(a):
       a = a.split('\n')
     if not TestCmd.is_List(b):
@@ skipping 10 matching lines @@
 
   # Ninja pipes stderr of subprocesses to stdout.
   if test.format in ['ninja', 'xcode-ninja'] \
       and expected_error in test.stdout():
     saw_expected_error[0] = True
 
   if saw_expected_error[0]:
     test.pass_test()
   else:
     test.fail_test()