Update from https://crrev.com/304121

net/quic/quic_utils.h

Index: net/quic/quic_utils.h
diff --git a/net/quic/quic_utils.h b/net/quic/quic_utils.h
index 1ecb37d6c9046415a38676a8a44dc96c0ca0d721..2c34ec4245b0c085c6ad760415dc6002f3611282 100644
--- a/net/quic/quic_utils.h
+++ b/net/quic/quic_utils.h
@@ -7,6 +7,8 @@
 #ifndef NET_QUIC_QUIC_UTILS_H_
 #define NET_QUIC_QUIC_UTILS_H_
 
+#include <string>
+
 #include "net/base/int128.h"
 #include "net/base/net_export.h"
 #include "net/quic/quic_protocol.h"
@@ -68,6 +70,11 @@ class NET_EXPORT_PRIVATE QuicUtils {
   // if not.
   static std::string TagToString(QuicTag tag);
 
+  // Returns the list of QUIC tags represented by the comma separated
+  // string in |connection_options|.
+  static QuicTagVector ParseQuicConnectionOptions(
+      const std::string& connection_options);
+
   // Given a binary buffer, return a hex+ASCII dump in the style of
   // tcpdump's -X and -XX options:
   // "0x0000:  0090 69bd 5400 000d 610f 0189 0800 4500  ..i.T...a.....E.\n"