Use quiche string libraries in third_party/quic/core

gfe-relnote: n/a, no functional change
PiperOrigin-RevId: 285401547
Change-Id: Ice6d421ff7058fe2d47aee426d7634b6d403ee3f
diff --git a/quic/core/quic_control_frame_manager.cc b/quic/core/quic_control_frame_manager.cc
index 3eed5e8..de49366 100644
--- a/quic/core/quic_control_frame_manager.cc
+++ b/quic/core/quic_control_frame_manager.cc
@@ -11,6 +11,7 @@
 #include "net/third_party/quiche/src/quic/platform/api/quic_bug_tracker.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_flag_utils.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_map_util.h"
+#include "net/third_party/quiche/src/common/platform/api/quiche_str_cat.h"
 
 namespace quic {
 
@@ -41,9 +42,10 @@
   if (control_frames_.size() > kMaxNumControlFrames) {
     session_->connection()->CloseConnection(
         QUIC_TOO_MANY_BUFFERED_CONTROL_FRAMES,
-        QuicStrCat("More than ", kMaxNumControlFrames,
-                   "buffered control frames, least_unacked: ", least_unacked_,
-                   ", least_unsent_: ", least_unsent_),
+        quiche::QuicheStrCat(
+            "More than ", kMaxNumControlFrames,
+            "buffered control frames, least_unacked: ", least_unacked_,
+            ", least_unsent_: ", least_unsent_),
         ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
     return;
   }
@@ -121,9 +123,10 @@
   if (control_frames_.size() > kMaxNumControlFrames) {
     session_->connection()->CloseConnection(
         QUIC_TOO_MANY_BUFFERED_CONTROL_FRAMES,
-        QuicStrCat("More than ", kMaxNumControlFrames,
-                   "buffered control frames, least_unacked: ", least_unacked_,
-                   ", least_unsent_: ", least_unsent_),
+        quiche::QuicheStrCat(
+            "More than ", kMaxNumControlFrames,
+            "buffered control frames, least_unacked: ", least_unacked_,
+            ", least_unsent_: ", least_unsent_),
         ConnectionCloseBehavior::SEND_CONNECTION_CLOSE_PACKET);
     return;
   }