Fix get_landmines builder()

build/get_landmines.py

 #!/usr/bin/env python
 # 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 file emits the list of reasons why a particular build needs to be clobbered
 (or a list of 'landmines').
 """
 
 import optparse
 import sys
 
 import landmine_utils
 
 
-builder = landmine_utils.platform
+builder = landmine_utils.builder
 distributor = landmine_utils.distributor
 gyp_defines = landmine_utils.gyp_defines
 gyp_msvs_version = landmine_utils.gyp_msvs_version
 platform = landmine_utils.platform
 
 
 def print_landmines(target):
   """
   ALL LANDMINES ARE EMITTED FROM HERE.
   target can be one of {'Release', 'Debug', 'Debug_x64', 'Release_x64'}.
@@ skipping 29 matching lines @@
 
   if args:
     parser.error('Unknown arguments %s' % args)
 
   print_landmines(options.target)
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())