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

third_party/WebKit/Source/core/html/TextControlElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * 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
@@ skipping 61 matching lines @@
 }
 
 TextControlElement::~TextControlElement() {}
 
 Node::InsertionNotificationRequest TextControlElement::insertedInto(
     ContainerNode* insertionPoint) {
   HTMLFormControlElementWithState::insertedInto(insertionPoint);
   if (!insertionPoint->isConnected())
     return InsertionDone;
   String initialValue = value();
-  setTextAsOfLastFormControlChangeEvent(initialValue.isNull() ? emptyString()
+  setTextAsOfLastFormControlChangeEvent(initialValue.isNull() ? emptyString
                                                               : initialValue);
   return InsertionDone;
 }
 
 void TextControlElement::dispatchFocusEvent(
     Element* oldFocusedElement,
     WebFocusType type,
     InputDeviceCapabilities* sourceCapabilities) {
   if (supportsPlaceholder())
     updatePlaceholderVisibility();
@@ skipping 673 matching lines @@
   if (textIsChanged && layoutObject()) {
     if (AXObjectCache* cache = document().existingAXObjectCache())
       cache->handleTextFormControlChanged(this);
   }
 }
 
 String TextControlElement::innerEditorValue() const {
   DCHECK(!openShadowRoot());
   HTMLElement* innerEditor = innerEditorElement();
   if (!innerEditor || !isTextControl())
-    return emptyString();
+    return emptyString;
 
   StringBuilder result;
   for (Node& node : NodeTraversal::inclusiveDescendantsOf(*innerEditor)) {
     if (isHTMLBRElement(node)) {
       DCHECK_EQ(&node, innerEditor->lastChild());
       if (&node != innerEditor->lastChild())
         result.append(newlineCharacter);
     } else if (node.isTextNode()) {
       result.append(toText(node).data());
     }
@@ skipping 114 matching lines @@
 
 void TextControlElement::copyNonAttributePropertiesFromElement(
     const Element& source) {
   const TextControlElement& sourceElement =
       static_cast<const TextControlElement&>(source);
   m_lastChangeWasUserEdit = sourceElement.m_lastChangeWasUserEdit;
   HTMLFormControlElement::copyNonAttributePropertiesFromElement(source);
 }
 
 }  // namespace blink