remove guard nolints from all headers

util/ssim.h

 /*
  *  Copyright 2013 The LibYuv Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS. All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 // Get SSIM for video sequence. Assuming RAW 4:2:0 Y:Cb:Cr format
 
-#ifndef UTIL_SSIM_H_  // NOLINT
+#ifndef UTIL_SSIM_H_
 #define UTIL_SSIM_H_
 
 #include <math.h>  // For log10()
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 #if !defined(INT_TYPES_DEFINED) && !defined(UINT8_TYPE_DEFINED)
 typedef unsigned char uint8;
 #define UINT8_TYPE_DEFINED
 #endif
 
 double CalcSSIM(const uint8* org, const uint8* rec,
                 const int image_width, const int image_height);
 
 double CalcLSSIM(double ssim);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
-#endif  // UTIL_SSIM_H_  // NOLINT
+#endif  // UTIL_SSIM_H_