Don't call lower() on KURL protocol/host

third_party/WebKit/Source/platform/weborigin/KnownPorts.cpp

 /*
  * Copyright (C) 2004, 2007, 2008, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Research In Motion Limited. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 51 matching lines @@
     return 990;
 
   return 0;
 }
 
 bool isPortAllowedForScheme(const KURL& url) {
   // Returns true for URLs without a port specified. This is needed to let
   // through non-network schemes that don't go over the network.
   if (!url.hasPort())
     return true;
-  String protocol = url.protocol().isNull() ? "" : url.protocol().lower();
+  String protocol = url.protocol();
+  if (protocol.isNull())
+    protocol = emptyString();
   unsigned short effectivePort = url.port();
   if (!effectivePort)
     effectivePort = defaultPortForProtocol(protocol);
   StringUTF8Adaptor utf8(protocol);
   return net::IsPortAllowedForScheme(effectivePort,
                                      std::string(utf8.data(), utf8.length()));
 }
 
 }  // namespace blink