[MERGE]

tools/brainlint.py

@@ -2334,6 +2334,7 @@ def CheckLanguage(filename, clean_lines, linenum, file_extension, include_state,
           % (match.group(1), match.group(2)))
 
   if Search(r'\busing namespace\b', line):
+    if( not file_extension == "cpp" ):
       error(filename, linenum, 'build/namespaces', 5,
                                'Do not use namespace using-directives.  '
                                'Use using-declarations instead.')