Deletes dead code.

net/quic/test_tools/quic_test_utils.h

Index: net/quic/test_tools/quic_test_utils.h
diff --git a/net/quic/test_tools/quic_test_utils.h b/net/quic/test_tools/quic_test_utils.h
index ed6d930a0efd6e41d4f2f46117ef789e64a5bc5a..3d3b6f57ed8c603aa6ebff75fdff90853710497b 100644
--- a/net/quic/test_tools/quic_test_utils.h
+++ b/net/quic/test_tools/quic_test_utils.h
@@ -1047,6 +1047,19 @@ void ExpectApproxEq(T expected, T actual, float relative_margin) {
   EXPECT_LE(expected - absolute_margin, actual);
 }
 
+template <typename T>
+QuicHeaderList AsHeaderList(const T& container) {
+  QuicHeaderList l;
+  l.OnHeaderBlockStart();
+  size_t total_size = 0;
+  for (auto p : container) {
+    total_size += p.first.size() + p.second.size();
+    l.OnHeader(p.first, p.second);
+  }
+  l.OnHeaderBlockEnd(total_size);
+  return l;
+}
+
 }  // namespace test
 }  // namespace net