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

third_party/WebKit/Source/core/page/PagePopupController.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:
  *
  *     * 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 61 matching lines @@
 }
 
 String PagePopupController::localizeNumberString(const String& numberString) {
   if (m_popupClient)
     return m_popupClient->locale().convertToLocalizedNumber(numberString);
   return numberString;
 }
 
 String PagePopupController::formatMonth(int year, int zeroBaseMonth) {
   if (!m_popupClient)
-    return emptyString();
+    return emptyString;
   DateComponents date;
   date.setMonthsSinceEpoch((year - 1970) * 12.0 + zeroBaseMonth);
   return m_popupClient->locale().formatDateTime(date, Locale::FormatTypeMedium);
 }
 
 String PagePopupController::formatShortMonth(int year, int zeroBaseMonth) {
   if (!m_popupClient)
-    return emptyString();
+    return emptyString;
   DateComponents date;
   date.setMonthsSinceEpoch((year - 1970) * 12.0 + zeroBaseMonth);
   return m_popupClient->locale().formatDateTime(date, Locale::FormatTypeShort);
 }
 
 String PagePopupController::formatWeek(int year,
                                        int weekNumber,
                                        const String& localizedDateString) {
   if (!m_popupClient)
-    return emptyString();
+    return emptyString;
   DateComponents week;
   bool setWeekResult = week.setWeek(year, weekNumber);
   DCHECK(setWeekResult);
   String localizedWeek = m_popupClient->locale().formatDateTime(week);
   return m_popupClient->locale().queryString(
       WebLocalizedString::AXCalendarWeekDescription, localizedWeek,
       localizedDateString);
 }
 
 void PagePopupController::clearPagePopupClient() {
   m_popupClient = nullptr;
 }
 
 void PagePopupController::setWindowRect(int x, int y, int width, int height) {
   m_popup.setWindowRect(IntRect(x, y, width, height));
 }
 
 }  // namespace blink