Fixing pylint.

test/mac/gyptest-rebuild.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 rebuilt correctly.
 """
 
 import TestGyp
 
-import os
 import sys
 
 if sys.platform == 'darwin':
   test = TestGyp.TestGyp(formats=['ninja', 'make', 'xcode'])
 
   CHDIR = 'rebuild'
   test.run_gyp('test.gyp', chdir=CHDIR)
 
   test.build('test.gyp', 'test_app', chdir=CHDIR)
 
   # Touch a source file, rebuild, and check that the app target is up-to-date.
   test.touch('rebuild/main.c')
   test.build('test.gyp', 'test_app', chdir=CHDIR)
 
   test.up_to_date('test.gyp', 'test_app', chdir=CHDIR)
 
   # Xcode runs postbuilds on every build, so targets with postbuilds are
   # never marked as up_to_date.
   if test.format != 'xcode':
     # Same for a framework bundle.
     test.build('test.gyp', 'test_framework_postbuilds', chdir=CHDIR)
     test.up_to_date('test.gyp', 'test_framework_postbuilds', chdir=CHDIR)
 
     # Test that an app bundle with a postbuild that touches the app binary needs
     # to be built only once.
     test.build('test.gyp', 'test_app_postbuilds', chdir=CHDIR)
     test.up_to_date('test.gyp', 'test_app_postbuilds', chdir=CHDIR)
 
   test.pass_test()