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

third_party/WebKit/Source/core/html/shadow/DateTimeNumericFieldElement.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 180 matching lines @@
 
 void DateTimeNumericFieldElement::stepUp() {
   int newValue = roundUp(m_hasValue ? m_value + 1 : defaultValueForStepUp());
   if (!m_range.isInRange(newValue))
     newValue = roundUp(m_range.minimum);
   m_typeAheadBuffer.clear();
   setValueAsInteger(newValue, DispatchEvent);
 }
 
 String DateTimeNumericFieldElement::value() const {
-  return m_hasValue ? formatValue(m_value) : emptyString();
+  return m_hasValue ? formatValue(m_value) : emptyString;
 }
 
 int DateTimeNumericFieldElement::valueAsInteger() const {
   return m_hasValue ? m_value : -1;
 }
 
 int DateTimeNumericFieldElement::typeAheadValue() const {
   if (m_typeAheadBuffer.length())
     return m_typeAheadBuffer.toString().toInt();
   return -1;
@@ skipping 17 matching lines @@
 int DateTimeNumericFieldElement::roundUp(int n) const {
   n -= m_step.stepBase;
   if (n >= 0)
     n = (n + m_step.step - 1) / m_step.step * m_step.step;
   else
     n = -(-n / m_step.step * m_step.step);
   return n + m_step.stepBase;
 }
 
 }  // namespace blink