Remove builtin/runtime name clash presubmit check.

tools/presubmit.py

 #!/usr/bin/env python
 #
 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 420 matching lines @@
         contents = handle.read()
         if not self.ProcessContents(file, contents):
           success = False
           violations += 1
       finally:
         handle.close()
     print "Total violating files: %s" % violations
     return success
 
 
-def CheckRuntimeVsNativesNameClashes(workspace):
-  code = subprocess.call(
-      [sys.executable, join(workspace, "tools", "check-name-clashes.py")])
-  return code == 0
-
-
 def CheckExternalReferenceRegistration(workspace):
   code = subprocess.call(
       [sys.executable, join(workspace, "tools", "external-reference-check.py")])
   return code == 0
 
 def CheckAuthorizedAuthor(input_api, output_api):
   """For non-googler/chromites committers, verify the author's email address is
   in AUTHORS.
   """
   # TODO(maruel): Add it to input_api?
@@ skipping 31 matching lines @@
   workspace = abspath(join(dirname(sys.argv[0]), '..'))
   parser = GetOptions()
   (options, args) = parser.parse_args()
   success = True
   print "Running C++ lint check..."
   if not options.no_lint:
     success = CppLintProcessor().Run(workspace) and success
   print "Running copyright header, trailing whitespaces and " \
         "two empty lines between declarations check..."
   success = SourceProcessor().Run(workspace) and success
-  success = CheckRuntimeVsNativesNameClashes(workspace) and success
   success = CheckExternalReferenceRegistration(workspace) and success
   if success:
     return 0
   else:
     return 1
 
 
 if __name__ == '__main__':
   sys.exit(Main())