Update libwebp to 0.4.0

third_party/libwebp/utils/bit_reader.c

 // Copyright 2010 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.
 // -----------------------------------------------------------------------------
 //
 // Boolean decoder
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
 #include "./bit_reader.h"
 
-#if defined(__cplusplus) || defined(c_plusplus)
-extern "C" {
-#endif
-
 #ifndef USE_RIGHT_JUSTIFY
 #define MK(X) (((range_t)(X) << (BITS)) | (MASK))
 #else
 #define MK(X) ((range_t)(X))
 #endif
 
 //------------------------------------------------------------------------------
 // VP8BitReader
 
 void VP8InitBitReader(VP8BitReader* const br,
@@ skipping 172 matching lines @@
     ShiftBytes(br);
     return val;
   } else {
     br->error_ = 1;
     return 0;
   }
 }
 
 //------------------------------------------------------------------------------
 
-#if defined(__cplusplus) || defined(c_plusplus)
-}    // extern "C"
-#endif