Python 3 compatibility

test/rules-variables/gyptest-rules-variables.py

 #!/usr/bin/env python
 
 # Copyright (c) 2011 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 rules related variables are expanded.
 """
 
+from __future__ import print_function
+
 import sys
 
 if sys.platform == 'win32':
-  print "This test is currently disabled: https://crbug.com/483696."
+  print("This test is currently disabled: https://crbug.com/483696.")
   sys.exit(0)
 
 
 import TestGyp
 
 test = TestGyp.TestGyp(formats=['ninja'])
 
 test.relocate('src', 'relocate/src')
 
 test.run_gyp('variables.gyp', chdir='relocate/src')
 
 test.build('variables.gyp', chdir='relocate/src')
 
 test.run_built_executable('all_rule_variables',
                           chdir='relocate/src',
                           stdout="input_root\ninput_dirname\ninput_path\n" +
                           "input_ext\ninput_name\n")
 
 test.pass_test()