Move test only MakeIOVector method to test_tools/quic_test_utils.h. No behavior change.

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 17c4e56850f433e26a7a007c43257078066d4e29..58e54ca24c68058884eb16442b0e6096aa229bd6 100644
--- a/net/quic/test_tools/quic_test_utils.h
+++ b/net/quic/test_tools/quic_test_utils.h
@@ -24,6 +24,7 @@
 #include "net/quic/core/quic_client_push_promise_index.h"
 #include "net/quic/core/quic_connection.h"
 #include "net/quic/core/quic_framer.h"
+#include "net/quic/core/quic_iovector.h"
 #include "net/quic/core/quic_protocol.h"
 #include "net/quic/core/quic_sent_packet_manager_interface.h"
 #include "net/quic/core/quic_server_session_base.h"
@@ -1047,6 +1048,15 @@ QuicHeaderList AsHeaderList(const T& container) {
   return l;
 }
 
+// Utility function that returns an QuicIOVector object wrapped around |str|.
+// // |str|'s data is stored in |iov|.
+inline QuicIOVector MakeIOVector(base::StringPiece str, struct iovec* iov) {
+  iov->iov_base = const_cast<char*>(str.data());
+  iov->iov_len = static_cast<size_t>(str.size());
+  QuicIOVector quic_iov(iov, 1, str.size());
+  return quic_iov;
+}
+
 }  // namespace test
 }  // namespace net