[presubmit] Fix whitespace/empty_loop_body linter violations.

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 50 matching lines @@
 -build/include_what_you_use
 -build/namespaces
 -readability/check
 -readability/inheritance
 -readability/namespace
 -readability/nolint
 +readability/streams
 -runtime/references
 -runtime/threadsafe_fn
 -whitespace/semicolon
--whitespace/empty_loop_body
 """.split()
 
 LINT_OUTPUT_PATTERN = re.compile(r'^.+[:(]\d+[:)]|^Done processing')
 FLAGS_LINE = re.compile("//\s*Flags:.*--([A-z0-9-])+_[A-z0-9].*\n")
 
 def CppLintWorker(command):
   try:
     process = subprocess.Popen(command, stderr=subprocess.PIPE)
     process.wait()
     out_lines = ""
@@ skipping 378 matching lines @@
   success = SourceProcessor().Run(workspace) and success
   success = CheckExternalReferenceRegistration(workspace) and success
   if success:
     return 0
   else:
     return 1
 
 
 if __name__ == '__main__':
   sys.exit(Main())