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

third_party/WebKit/Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc.
  * All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
@@ skipping 3048 matching lines @@
   for (Node* child = firstChild(); child; child = child->nextSibling()) {
     if (!child->isTextNode())
       continue;
     Text* text = toText(child);
     if (!firstTextNode)
       firstTextNode = text;
     else
       foundMultipleTextNodes = true;
     unsigned length = text->data().length();
     if (length > std::numeric_limits<unsigned>::max() - totalLength)
-      return emptyString();
+      return emptyString;
     totalLength += length;
   }
 
   if (!firstTextNode)
-    return emptyString();
+    return emptyString;
 
   if (firstTextNode && !foundMultipleTextNodes) {
     firstTextNode->atomize();
     return firstTextNode->data();
   }
 
   StringBuilder content;
   content.reserveCapacity(totalLength);
   for (Node* child = firstTextNode; child; child = child->nextSibling()) {
     if (!child->isTextNode())
@@ skipping 1056 matching lines @@
 }
 
 DEFINE_TRACE_WRAPPERS(Element) {
   if (hasRareData()) {
     visitor->traceWrappers(elementRareData());
   }
   ContainerNode::traceWrappers(visitor);
 }
 
 }  // namespace blink