Use UintToString() to convert port numbers.

url/scheme_host_port.cc

 // Copyright 2015 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 "url/scheme_host_port.h"
 
 #include <string.h>
 
 #include "base/logging.h"
 #include "base/numerics/safe_conversions.h"
@@ skipping 140 matching lines @@
     return result;
 
   // Omit the port component if the port matches with the default port
   // defined for the scheme, if any.
   int default_port = DefaultPortForScheme(scheme_.data(),
                                           static_cast<int>(scheme_.length()));
   if (default_port == PORT_UNSPECIFIED)
     return result;
   if (port_ != default_port) {
     result.push_back(':');
-    result.append(base::IntToString(port_));
+    result.append(base::UintToString(port_));
   }
 
   return result;
 }
 
 bool SchemeHostPort::Equals(const SchemeHostPort& other) const {
   return port_ == other.port() && scheme_ == other.scheme() &&
          host_ == other.host();
 }
 
 bool SchemeHostPort::operator<(const SchemeHostPort& other) const {
   if (port_ != other.port_)
     return port_ < other.port_;
   if (scheme_ != other.scheme_)
     return scheme_ < other.scheme_;
   if (host_ != other.host_)
     return host_ < other.host_;
   return false;
 }
 
 }  // namespace url