Add QuicStrCat.

net/tools/quic/quic_dispatcher_test.cc

Index: net/tools/quic/quic_dispatcher_test.cc
diff --git a/net/tools/quic/quic_dispatcher_test.cc b/net/tools/quic/quic_dispatcher_test.cc
index f3c7226b22f7e91a3e42f1d738bdec671a7af7a3..6470ebd4042ff4135a2958d7167ddf1902a63e7b 100644
--- a/net/tools/quic/quic_dispatcher_test.cc
+++ b/net/tools/quic/quic_dispatcher_test.cc
@@ -1205,9 +1205,8 @@ TEST_P(BufferedPacketStoreTest, ProcessNonChloPacketsUptoLimitAndProcessChlo) {
       .Times(1);
   for (size_t i = 1; i <= kDefaultMaxUndecryptablePackets + 1; ++i) {
     ProcessPacket(client_address, conn_id, true, false,
-                  "data packet " + IntToString(i + 1),
-                  PACKET_8BYTE_CONNECTION_ID, PACKET_6BYTE_PACKET_NUMBER,
-                  kDefaultPathId,
+                  QuicStrCat("data packet ", i + 1), PACKET_8BYTE_CONNECTION_ID,
+                  PACKET_6BYTE_PACKET_NUMBER, kDefaultPathId,
                   /*packet_number=*/i + 1);
   }
   EXPECT_EQ(0u, dispatcher_->session_map().size())
@@ -1259,7 +1258,7 @@ TEST_P(BufferedPacketStoreTest,
       }
     }
     ProcessPacket(client_address, conn_id, true, false,
-                  "data packet on connection " + IntToString(i),
+                  QuicStrCat("data packet on connection ", i),
                   PACKET_8BYTE_CONNECTION_ID, PACKET_6BYTE_PACKET_NUMBER,
                   kDefaultPathId,
                   /*packet_number=*/2);
@@ -1334,7 +1333,7 @@ TEST_P(BufferedPacketStoreTest, ReceiveRetransmittedCHLO) {
   server_address_ = QuicSocketAddress(QuicIpAddress::Any4(), 5);
   QuicConnectionId conn_id = 1;
   ProcessPacket(client_address, conn_id, true, false,
-                "data packet " + IntToString(2), PACKET_8BYTE_CONNECTION_ID,
+                QuicStrCat("data packet ", 2), PACKET_8BYTE_CONNECTION_ID,
                 PACKET_6BYTE_PACKET_NUMBER, kDefaultPathId,
                 /*packet_number=*/2);
 
@@ -1369,7 +1368,7 @@ TEST_P(BufferedPacketStoreTest, ReceiveCHLOAfterExpiration) {
   server_address_ = QuicSocketAddress(QuicIpAddress::Any4(), 5);
   QuicConnectionId conn_id = 1;
   ProcessPacket(client_address, conn_id, true, false,
-                "data packet " + IntToString(2), PACKET_8BYTE_CONNECTION_ID,
+                QuicStrCat("data packet ", 2), PACKET_8BYTE_CONNECTION_ID,
                 PACKET_6BYTE_PACKET_NUMBER, kDefaultPathId,
                 /*packet_number=*/2);