mini_installer code cleanups (no functional changes).

chrome/test/mini_installer/test_installer.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """This script tests the installer with test cases specified in the config file.
 
 For each test case, it checks that the machine states after the execution of
 each command match the expected machine states. For more details, take a look at
 the design documentation at http://goo.gl/Q0rGM6
 """
@@ skipping 236 matching lines @@
 
   Args:
     mini_installer_path: The path to mini_installer.exe.
 
   Returns:
     True if the mini_installer is a component build, False otherwise.
   """
   query_command = mini_installer_path + ' --query-component-build'
   script_dir = os.path.dirname(os.path.abspath(__file__))
   exit_status = subprocess.call(query_command, shell=True, cwd=script_dir)
-  return exit_status != 0
+  return exit_status == 0
 
 
 def main():
   usage = 'usage: %prog [options] config_filename'
   parser = optparse.OptionParser(usage, description='Test the installer.')
   parser.add_option('--build-dir', default='out',
                     help='Path to main build directory (the parent of the '
                          'Release or Debug directory)')
   parser.add_option('--target', default='Release',
                     help='Build target (Release or Debug)')
@@ skipping 17 matching lines @@
     return 0
 
   config = ParseConfigFile(config_filename)
   if not RunTests(mini_installer_path, config, options.force_clean):
     return 1
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())