Make HPACK static table static and immutable.

net/spdy/hpack_decoder.cc

 // Copyright 2014 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.
 
 #include "net/spdy/hpack_decoder.h"
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "net/spdy/hpack_constants.h"
 #include "net/spdy/hpack_output_stream.h"
@@ skipping 109 matching lines @@
   }
   header_table_.SetMaxSize(size);
   return true;
 }
 
 bool HpackDecoder::DecodeNextIndexedHeader(HpackInputStream* input_stream) {
   uint32 index = 0;
   if (!input_stream->DecodeNextUint32(&index))
     return false;
 
-  HpackEntry* entry = header_table_.GetByIndex(index);
+  const HpackEntry* entry = header_table_.GetByIndex(index);
   if (entry == NULL)
     return false;
 
   HandleHeaderRepresentation(entry->name(), entry->value());
   return true;
 }
 
 bool HpackDecoder::DecodeNextLiteralHeader(HpackInputStream* input_stream,
                                            bool should_index) {
   StringPiece name;
@@ skipping 45 matching lines @@
     return result;
   } else if (input_stream->MatchPrefixAndConsume(
       kStringLiteralIdentityEncoded)) {
     return input_stream->DecodeNextIdentityString(output);
   } else {
     return false;
   }
 }
 
 }  // namespace net