Make HPACK static table static and immutable.

net/spdy/hpack_decoder_test.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 <map>
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 74 matching lines @@
     return decoder_peer_.decoded_block();
   }
 
   const std::map<string, string>& DecodeBlockExpectingSuccess(StringPiece str) {
     EXPECT_TRUE(DecodeHeaderBlock(str));
     return decoded_block();
   }
 
   void expectEntry(size_t index, size_t size, const string& name,
                    const string& value) {
-    HpackEntry* entry = decoder_peer_.header_table()->GetByIndex(index);
+    const HpackEntry* entry = decoder_peer_.header_table()->GetByIndex(index);
     EXPECT_EQ(name, entry->name()) << "index " << index;
     EXPECT_EQ(value, entry->value());
     EXPECT_EQ(size, entry->Size());
     EXPECT_EQ(index, decoder_peer_.header_table()->IndexOf(entry));
   }
 
   HpackDecoder decoder_;
   test::HpackDecoderPeer decoder_peer_;
 };
 
@@ skipping 541 matching lines @@
   expectEntry(62, 98, "set-cookie", "foo=ASDJKHQKBZXOQWEOPIUAXQWEOIU;"
               " max-age=3600; version=1");
   expectEntry(63, 52, "content-encoding", "gzip");
   expectEntry(64, 65, "date", "Mon, 21 Oct 2013 20:13:22 GMT");
   EXPECT_EQ(215u, decoder_peer_.header_table()->size());
 }
 
 }  // namespace
 
 }  // namespace net