Add QuicStrCat.

net/quic/core/quic_server_id.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/core/quic_server_id.h"
 
 #include <tuple>
 
 #include "base/logging.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/port_util.h"
+#include "net/quic/platform/api/quic_str_cat.h"
 #include "url/gurl.h"
 
 using std::string;
 
 namespace net {
 
 QuicServerId::QuicServerId() : privacy_mode_(PRIVACY_MODE_DISABLED) {}
 
 QuicServerId::QuicServerId(const HostPortPair& host_port_pair,
                            PrivacyMode privacy_mode)
@@ skipping 23 matching lines @@
 QuicServerId QuicServerId::FromString(const std::string& str) {
   GURL url(str);
   if (!url.is_valid())
     return QuicServerId();
   return QuicServerId(HostPortPair::FromURL(url), url.path_piece() == "/private"
                                                       ? PRIVACY_MODE_ENABLED
                                                       : PRIVACY_MODE_DISABLED);
 }
 
 string QuicServerId::ToString() const {
-  return "https://" + host_port_pair_.ToString() +
-         (privacy_mode_ == PRIVACY_MODE_ENABLED ? "/private" : "");
+  return QuicStrCat("https://", host_port_pair_.ToString(),
+                    (privacy_mode_ == PRIVACY_MODE_ENABLED ? "/private" : ""));
 }
 
 }  // namespace net