[presubmit] Enable readability/namespace linter checking.

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 32 matching lines @@
 import sys
 import subprocess
 import multiprocessing
 from subprocess import PIPE
 
 # Special LINT rules diverging from default and reason.
 # build/header_guard: Our guards have the form "V8_FOO_H_", not "SRC_FOO_H_".
 # build/include_what_you_use: Started giving false positives for variables
 #   named "string" and "map" assuming that you needed to include STL headers.
 # TODO(bmeurer): Fix and re-enable readability/check
-# TODO(mstarzinger): Fix and re-enable readability/namespace
 
 LINT_RULES = """
 -build/header_guard
 +build/include_alpha
 -build/include_what_you_use
 -build/namespaces
 -readability/check
 -readability/inheritance
--readability/namespace
 -readability/nolint
 +readability/streams
 -runtime/references
 """.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:
@@ skipping 381 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())