Remove more unused landmines code

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').
 """
 
@@ skipping 26 matching lines @@
     print 'Clobber to fix gyp not rename package name (crbug.com/457038)'
   if platform() == 'win':
     print 'Compile on cc_unittests fails due to symbols removed in r185063.'
   if platform() == 'linux':
     print 'Builders switching from make to ninja will clobber on this.'
   if platform() == 'mac':
     print 'Switching from bundle to unbundled dylib (issue 14743002).'
   if platform() in ('win', 'mac'):
     print ('Improper dependency for create_nmf.py broke in r240802, '
            'fixed in r240860.')
-  if (platform() == 'win' and
-      gyp_msvs_version() == '2012' and
-      gyp_defines().get('target_arch') == 'x64' and
-      gyp_defines().get('dcheck_always_on') == '1'):
-    print "Switched win x64 trybots from VS2010 to VS2012."
-  if (platform() == 'win' and
-      gyp_msvs_version().startswith('2013')):
-    print "Switch to VS2013"
   if (platform() == 'win' and gyp_msvs_version().startswith('2015')):
     print 'Switch to VS2015 Update 2'
   print 'Need to clobber everything due to an IDL change in r154579 (blink)'
   print 'Need to clobber everything due to gen file moves in r175513 (Blink)'
   if (platform() != 'ios'):
     print 'Clobber to get rid of obselete test plugin after r248358'
     print 'Clobber to rebuild GN files for V8'
   print 'Clobber to get rid of stale generated mojom.h files'
   print 'Need to clobber everything due to build_nexe change in nacl r13424'
   print '[chromium-dev] PSA: clobber build needed for IDR_INSPECTOR_* compil...'
@@ skipping 15 matching lines @@
     print 'Clobber to remove libsystem.dylib. See crbug.com/620075'
 
 
 def main():
   print_landmines()
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())