Update libwebp to 0.4.0

third_party/libwebp/dec/buffer.c

 // Copyright 2011 Google Inc. All Rights Reserved.
 //
 // Use of this source code is governed by a BSD-style license
 // that can be found in the COPYING 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.
 // -----------------------------------------------------------------------------
 //
 // Everything about WebPDecBuffer
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
 #include <stdlib.h>
 
 #include "./vp8i.h"
 #include "./webpi.h"
 #include "../utils/utils.h"
 
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
 //------------------------------------------------------------------------------
 // WebPDecBuffer
 
 // Number of bytes per pixel for the different color-spaces.
 static const int kModeBpp[MODE_LAST] = {
   3, 4, 3, 4, 4, 2, 2,
   4, 4, 4, 2,    // pre-multiplied modes
   1, 1 };
 
 // Check that webp_csp_mode is within the bounds of WEBP_CSP_MODE.
@@ skipping 171 matching lines @@
     *dst = *src;
     if (src->private_memory != NULL) {
       src->is_external_memory = 1;   // src relinquishes ownership
       src->private_memory = NULL;
     }
   }
 }
 
 //------------------------------------------------------------------------------
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif