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

third_party/WebKit/Source/core/html/shadow/DateTimeSymbolicFieldElement.cpp

 /*
  * Copyright (C) 2012 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:
  * 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
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 123 matching lines @@
   if (hasValue()) {
     if (!indexIsInRange(++m_selectedIndex))
       m_selectedIndex = m_minimumIndex;
   } else {
     m_selectedIndex = m_minimumIndex;
   }
   updateVisibleValue(DispatchEvent);
 }
 
 String DateTimeSymbolicFieldElement::value() const {
-  return hasValue() ? m_symbols[m_selectedIndex] : emptyString();
+  return hasValue() ? m_symbols[m_selectedIndex] : emptyString;
 }
 
 int DateTimeSymbolicFieldElement::valueAsInteger() const {
   return m_selectedIndex;
 }
 
 int DateTimeSymbolicFieldElement::valueForARIAValueNow() const {
   // Synchronize with minimum/maximum adjustment in initialize().
   return m_selectedIndex + 1;
 }
@@ skipping 12 matching lines @@
 
 int DateTimeSymbolicFieldElement::optionCount() const {
   return m_symbols.size();
 }
 
 String DateTimeSymbolicFieldElement::optionAtIndex(int index) const {
   return m_symbols[index];
 }
 
 }  // namespace blink