Replace va_arg version of crypto_test_utils::Message with a more modern vector argument version.

net/quic/test_tools/crypto_test_utils.h

Index: net/quic/test_tools/crypto_test_utils.h
diff --git a/net/quic/test_tools/crypto_test_utils.h b/net/quic/test_tools/crypto_test_utils.h
index 7d1d7ecd8df9481c08e6249fa956369034af3ecb..1147697ba5fff8739751d1cbb565e9658c9779ff 100644
--- a/net/quic/test_tools/crypto_test_utils.h
+++ b/net/quic/test_tools/crypto_test_utils.h
@@ -175,19 +175,21 @@ void FillInDummyReject(CryptoHandshakeMessage* rej, bool reject_is_stateless);
 // format). It CHECK fails if there's a parse error.
 QuicTag ParseTag(const char* tagstr);
 
-// Message constructs a handshake message from a variable number of
-// arguments. |message_tag| is passed to |ParseTag| and used as the tag of
-// the resulting message. The arguments are taken in pairs and nullptr
-// terminated. The first of each pair is the tag of a tag/value and is given
-// as an argument to |ParseTag|. The second is the value of the tag/value
-// pair and is either a hex dump, preceeded by a '#', or a raw value.
+// Message constructs a CHLO message from a provided vector of tag/value pairs.
+// The first of each pair is the tag of a tag/value and is given as an argument
+// to |ParseTag|. The second is the value of the tag/value pair and is either a
+// hex dump, preceeded by a '#', or a raw value. If minimum_size_bytes is
+// provided then the message will be padded to this minimum size.
 //
-//   Message(
-//       "CHLO",
-//       "NOCE", "#11223344",
-//       "SNI", "www.example.com",
-//       nullptr);
-CryptoHandshakeMessage Message(const char* message_tag, ...);
+//   CreateCHLO(
+//       {{"NOCE", "#11223344"},
+//        {"SNI", "www.example.com"}},
+//       optional_minimum_size_bytes);
+CryptoHandshakeMessage CreateCHLO(
+    std::vector<std::pair<std::string, std::string>> tags_and_values);
+CryptoHandshakeMessage CreateCHLO(
+    std::vector<std::pair<std::string, std::string>> tags_and_values,
+    int minimum_size_bytes);
 
 // ChannelIDSourceForTesting returns a ChannelIDSource that generates keys
 // deterministically based on the hostname given in the GetChannelIDKey call.