Remove usages of QuicMakeUnique, Http2MakeUnique, SpdyMakeUnique.

This is made possible by all embedders finally supporting C++14's
std::make_unique, which is already used in more than 100 files in quic/.

gfe-relnote: n/a, no functional change.
PiperOrigin-RevId: 273935577
Change-Id: Icd6dd234422f286d897ea13ae609a67310f96380
diff --git a/quic/core/quic_session.cc b/quic/core/quic_session.cc
index 495d670..57bdee3 100644
--- a/quic/core/quic_session.cc
+++ b/quic/core/quic_session.cc
@@ -18,6 +18,7 @@
 #include "net/third_party/quiche/src/quic/platform/api/quic_flags.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_logging.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_map_util.h"
+#include "net/third_party/quiche/src/quic/platform/api/quic_ptr_util.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_server_stats.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_stack_trace.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_str_cat.h"