Change HpackHuffmanDecoder::CanonicalToSource() return type.

net/spdy/core/hpack/hpack_huffman_decoder.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_SPDY_CORE_HPACK_HPACK_HUFFMAN_DECODER_H_
 #define NET_SPDY_CORE_HPACK_HPACK_HUFFMAN_DECODER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 39 matching lines @@
   // corresponding canonical symbol.
   // Returns a value in the range [0, 256] (257 values). 256 is the EOS symbol,
   // which must not be explicitly encoded; the HPACK spec says that a decoder
   // must treat EOS as a decoding error.
   // Note that the canonical symbol is not the final value to be output because
   // the source symbols are not in descending probability order, so another
   // translation is required (see CanonicalToSource below).
   static HuffmanWord DecodeToCanonical(HuffmanCodeLength code_length,
                                        HuffmanWord bits);
 
-  // Converts a canonical symbol to the source symbol (the char in the original
+  // Converts a canonical symbol to the source symbol (the octet in the original
   // string that was encoded).
-  static char CanonicalToSource(HuffmanWord canonical);
+  static uint8_t CanonicalToSource(HuffmanWord canonical);
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_CORE_HPACK_HPACK_HUFFMAN_DECODER_H_