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

third_party/WebKit/Source/core/layout/LayoutQuote.cpp

 /**
  * Copyright (C) 2011 Nokia Inc.  All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 267 matching lines @@
       return toLayoutTextFragment(child);
   }
 
   return nullptr;
 }
 
 String LayoutQuote::computeText() const {
   switch (m_type) {
     case NO_OPEN_QUOTE:
     case NO_CLOSE_QUOTE:
-      return emptyString();
+      return emptyString;
     case CLOSE_QUOTE:
       return quotesData()->getCloseQuote(m_depth - 1).impl();
     case OPEN_QUOTE:
       return quotesData()->getOpenQuote(m_depth).impl();
   }
   ASSERT_NOT_REACHED();
-  return emptyString();
+  return emptyString;
 }
 
 const QuotesData* LayoutQuote::quotesData() const {
   if (const QuotesData* customQuotes = style()->quotes())
     return customQuotes;
 
   if (const QuotesData* quotes = quotesDataForLanguage(style()->locale()))
     return quotes;
 
   return basicQuotesData();
@@ skipping 84 matching lines @@
         if (m_depth)
           m_depth--;
         break;
     }
   }
   if (oldDepth != m_depth)
     updateText();
 }
 
 }  // namespace blink