Remove Http2StrCat, use QuicheStrCat instead.

gfe-relnote: n/a, no functional change.
PiperOrigin-RevId: 289866176
Change-Id: I87a1f30ed7efc348196d8666b719ba0a7de97f3f
diff --git a/http2/hpack/hpack_string.cc b/http2/hpack/hpack_string.cc
index 77ae5a3..cb22f51 100644
--- a/http2/hpack/hpack_string.cc
+++ b/http2/hpack/hpack_string.cc
@@ -7,7 +7,7 @@
 #include <utility>
 
 #include "net/third_party/quiche/src/http2/platform/api/http2_logging.h"
-#include "net/third_party/quiche/src/http2/platform/api/http2_string_utils.h"
+#include "net/third_party/quiche/src/common/platform/api/quiche_str_cat.h"
 
 namespace http2 {
 
@@ -62,8 +62,8 @@
 }
 
 std::string HpackStringPair::DebugString() const {
-  return Http2StrCat("HpackStringPair(name=", name.ToString(),
-                     ", value=", value.ToString(), ")");
+  return quiche::QuicheStrCat("HpackStringPair(name=", name.ToString(),
+                              ", value=", value.ToString(), ")");
 }
 
 std::ostream& operator<<(std::ostream& os, const HpackStringPair& p) {