Deletes dead code.

net/quic/core/quic_header_list.h

 // Copyright (c) 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_QUIC_QUIC_HEADER_LIST_H_
 #define NET_QUIC_QUIC_HEADER_LIST_H_
 
+#include <algorithm>
 #include <deque>
 #include <functional>
 
 #include "base/strings/string_piece.h"
 #include "net/base/net_export.h"
 #include "net/quic/core/quic_bug_tracker.h"
 #include "net/spdy/spdy_header_block.h"
 #include "net/spdy/spdy_headers_handler_interface.h"
 
 namespace net {
@@ skipping 35 matching lines @@
 
   std::string DebugString() const;
 
  private:
   std::deque<std::pair<std::string, std::string>> header_list_;
   size_t max_uncompressed_header_bytes_;
   size_t uncompressed_header_bytes_;
   size_t compressed_header_bytes_;
 };
 
+inline bool operator==(const QuicHeaderList& l1, const QuicHeaderList& l2) {
+  auto pred = [](const std::pair<std::string, std::string>& p1,
+                 const std::pair<std::string, std::string>& p2) {
+    return p1.first == p2.first && p1.second == p2.second;
+  };
+  return std::equal(l1.begin(), l1.end(), l2.begin(), pred);
+}
+
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_HEADER_LIST_H_