Correctly construct ("file", "", 0) SecurityOrigins.

Source/platform/weborigin/SecurityOrigin.cpp

 /*
  * Copyright (C) 2007 Apple Inc. 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 492 matching lines @@
 PassRefPtr<SecurityOrigin> SecurityOrigin::createFromString(const String& originString)
 {
     return SecurityOrigin::create(KURL(KURL(), originString));
 }
 
 PassRefPtr<SecurityOrigin> SecurityOrigin::create(const String& protocol, const String& host, int port)
 {
     if (port < 0 || port > MaxAllowedPort)
         return createUnique();
     String decodedHost = decodeURLEscapeSequences(host);
-    return create(KURL(KURL(), protocol + "://" + host + ":" + String::number(port) + "/"));
+    String portPart = port ? ":" + String::number(port) : String();
+    return create(KURL(KURL(), protocol + "://" + host + portPart + "/"));
 }
 
 bool SecurityOrigin::isSameSchemeHostPort(const SecurityOrigin* other) const
 {
     if (m_host != other->m_host)
         return false;
 
     if (m_protocol != other->m_protocol)
         return false;
 
@@ skipping 19 matching lines @@
 }
 
 void SecurityOrigin::transferPrivilegesFrom(const SecurityOrigin& origin)
 {
     m_universalAccess = origin.m_universalAccess;
     m_canLoadLocalResources = origin.m_canLoadLocalResources;
     m_blockLocalAccessFromLocalOrigin = origin.m_blockLocalAccessFromLocalOrigin;
 }
 
 } // namespace blink