Replace WTF::emptyString{16Bit}() with a static global

third_party/WebKit/Source/modules/filesystem/EntryBase.cpp

 /*
  * Copyright (C) 2011 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 31 matching lines @@
       m_name(DOMFilePath::getName(fullPath)) {}
 
 EntryBase::~EntryBase() {}
 
 String EntryBase::toURL() const {
   if (!m_cachedURL.isNull())
     return m_cachedURL;
 
   // Some filesystem type may not support toURL.
   if (!m_fileSystem->supportsToURL())
-    m_cachedURL = emptyString();
+    m_cachedURL = emptyString;
   else
     m_cachedURL = m_fileSystem->createFileSystemURL(this).getString();
   return m_cachedURL;
 }
 
 DEFINE_TRACE(EntryBase) {
   visitor->trace(m_fileSystem);
 }
 
 }  // namespace blink