Small improvements to MixedContentChecker.

third_party/WebKit/Source/platform/network/NetworkUtils.cpp

 // Copyright 2016 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 "platform/network/NetworkUtils.h"
 
 #include "net/base/ip_address.h"
+#include "net/base/url_util.h"
 #include "wtf/text/StringUTF8Adaptor.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 namespace NetworkUtils {
 
 bool isReservedIPAddress(const String& host)
 {
     net::IPAddress address;
     StringUTF8Adaptor utf8(host);
     if (!net::ParseURLHostnameToAddress(utf8.asStringPiece(), &address))
         return false;
     return address.IsReserved();
 }
 
+bool isLocalHostname(const String& host, bool* isLocal6)
+{
+    StringUTF8Adaptor utf8(host);
+    return net::IsLocalHostname(utf8.asStringPiece(), isLocal6);
+}
+
 } // NetworkUtils
 
 } // namespace blink