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

third_party/WebKit/Source/core/dom/CharacterData.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Apple 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.
@@ skipping 40 matching lines @@
   void deleteData(unsigned offset, unsigned count, ExceptionState&);
 
   bool containsOnlyWhitespace() const;
 
   StringImpl* dataImpl() { return m_data.impl(); }
 
   void parserAppendData(const String&);
 
  protected:
   CharacterData(TreeScope& treeScope, const String& text, ConstructionType type)
-      : Node(&treeScope, type), m_data(!text.isNull() ? text : emptyString()) {
+      : Node(&treeScope, type), m_data(!text.isNull() ? text : emptyString) {
     DCHECK(type == CreateOther || type == CreateText ||
            type == CreateEditingText);
   }
 
   void setDataWithoutUpdate(const String& data) {
     DCHECK(!data.isNull());
     m_data = data;
   }
   enum UpdateSource {
     UpdateFromParser,
@@ skipping 18 matching lines @@
       delete;  // This will catch anyone doing an unnecessary check.
   bool isElementNode() const =
       delete;  // This will catch anyone doing an unnecessary check.
 };
 
 DEFINE_NODE_TYPE_CASTS(CharacterData, isCharacterDataNode());
 
 }  // namespace blink
 
 #endif  // CharacterData_h