Python 3 compatibility

test/mac/gyptest-app-assets-catalog.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 app bundles are built correctly.
 """
 
+from __future__ import print_function
+
 import TestGyp
 import TestMac
 
 import os
 import plistlib
 import subprocess
 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)
 
 def ExpectEq(expected, actual):
   if expected != actual:
-    print >>sys.stderr, 'Expected "%s", got "%s"' % (expected, actual)
+    print('Expected "%s", got "%s"' % (expected, actual), file=sys.stderr)
     test.fail_test()
 
 def ls(path):
   '''Returns a list of all files in a directory, relative to the directory.'''
   result = []
   for dirpath, _, files in os.walk(path):
     for f in files:
       result.append(os.path.join(dirpath, f)[len(path) + 1:])
   return result
 
@@ skipping 78 matching lines @@
      set(['Contents/MacOS/Test App Assets Catalog Gyp',
           'Contents/Info.plist',
           'Contents/Resources/English.lproj/MainMenu.nib',
           'Contents/PkgInfo',
           ] + extra_content_files +
          [os.path.join('Contents/Resources/English.lproj', f)
              for f in strings_files]):
     test.fail_test()
 
   test.pass_test()