Deletes dead code.

net/quic/core/quic_header_list.h

Index: net/quic/core/quic_header_list.h
diff --git a/net/quic/core/quic_header_list.h b/net/quic/core/quic_header_list.h
index 529bde5b097bbc3644d7cdd1fc31fbe3c834d69e..e74275b3c9bfb2a422d1394d7a749bc17b2624fe 100644
--- a/net/quic/core/quic_header_list.h
+++ b/net/quic/core/quic_header_list.h
@@ -5,6 +5,7 @@
 #ifndef NET_QUIC_QUIC_HEADER_LIST_H_
 #define NET_QUIC_QUIC_HEADER_LIST_H_
 
+#include <algorithm>
 #include <deque>
 #include <functional>
 
@@ -60,6 +61,14 @@ class NET_EXPORT_PRIVATE QuicHeaderList : public SpdyHeadersHandlerInterface {
   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_