Update libwebp to 0.4.0

third_party/libwebp/utils/color_cache.c

 // Copyright 2012 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.
 // -----------------------------------------------------------------------------
 //
 // Color Cache for WebP Lossless
 //
 // Author: Jyrki Alakuijala (jyrki@google.com)
 
 #include <assert.h>
 #include <stdlib.h>
 #include "./color_cache.h"
 #include "../utils/utils.h"
 
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
 //------------------------------------------------------------------------------
 // VP8LColorCache.
 
 int VP8LColorCacheInit(VP8LColorCache* const cc, int hash_bits) {
   const int hash_size = 1 << hash_bits;
   assert(cc != NULL);
   assert(hash_bits > 0);
   cc->colors_ = (uint32_t*)WebPSafeCalloc((uint64_t)hash_size,
                                           sizeof(*cc->colors_));
   if (cc->colors_ == NULL) return 0;
   cc->hash_shift_ = 32 - hash_bits;
   return 1;
 }
 
 void VP8LColorCacheClear(VP8LColorCache* const cc) {
   if (cc != NULL) {
     free(cc->colors_);
     cc->colors_ = NULL;
   }
 }
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}
-#endif