Fix ninja "multiple rules" warning.

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 11 matching lines @@
 
 def print_landmines():
   """
   ALL LANDMINES ARE EMITTED FROM HERE.
   """
   if (distributor() == 'goma' and platform() == 'win32' and
       builder() == 'ninja'):
     print 'Need to clobber winja goma due to backend cwd cache fix.'
   if platform() == 'android':
     print 'Clobber: To delete newly generated mojo class files.'
+    print 'Clobber to ensure that recipe tests do not break (issue 680923002).'
   if platform() == 'win' and builder() == 'ninja':
     print 'Compile on cc_unittests fails due to symbols removed in r185063.'
   if platform() == 'linux' and builder() == 'ninja':
     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 builder() == 'ninja' and
@@ skipping 19 matching lines @@
     print 'Clobber to delete incompatible object binary format with NDK r10c'
 
 
 def main():
   print_landmines()
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())