message: fix nested scope issue
diff: @@ -64,11 +64,11 @@ class LogMessageFatal : public LogMessage {
  };
  #define _TF_LOG_INFO \
  - ::tensorflow::internal::LogMessage(__FILE__, __LINE__, tensorflow::INFO)
  + ::tensorflow::internal::LogMessage(__FILE__, __LINE__, ::tensorflow::INFO)
  #define _TF_LOG_WARNING \
  - ::tensorflow::internal::LogMessage(__FILE__, __LINE__, tensorflow::WARNING)
  + ::tensorflow::internal::LogMessage(__FILE__, __LINE__, ::tensorflow::WARNING)
  #define _TF_LOG_ERROR \
  - ::tensorflow::internal::LogMessage(__FILE__, __LINE__, tensorflow::ERROR)
  + ::tensorflow::internal::LogMessage(__FILE__, __LINE__, ::tensorflow::ERROR)
  #define _TF_LOG_FATAL \
  ::tensorflow::internal::LogMessageFatal(__FILE__, __LINE__)
  