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

third_party/WebKit/Source/wtf/text/TextCodecLatin1.cpp

 /*
  * Copyright (C) 2004, 2006, 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 94 matching lines @@
   registrar("US-ASCII", newStreamingTextDecoderWindowsLatin1, 0);
 }
 
 String TextCodecLatin1::decode(const char* bytes,
                                size_t length,
                                FlushBehavior,
                                bool,
                                bool&) {
   LChar* characters;
   if (!length)
-    return emptyString();
+    return emptyString;
   String result = String::createUninitialized(length, characters);
 
   const uint8_t* source = reinterpret_cast<const uint8_t*>(bytes);
   const uint8_t* end = reinterpret_cast<const uint8_t*>(bytes + length);
   const uint8_t* alignedEnd = alignToMachineWord(end);
   LChar* destination = characters;
 
   while (source < end) {
     if (isASCII(*source)) {
       // Fast path for ASCII. Most Latin-1 text will be ASCII.
@@ skipping 158 matching lines @@
   return encodeCommon(characters, length, handling);
 }
 
 CString TextCodecLatin1::encode(const LChar* characters,
                                 size_t length,
                                 UnencodableHandling handling) {
   return encodeCommon(characters, length, handling);
 }
 
 }  // namespace WTF