Revert CompressibleString (and its UMA)

third_party/WebKit/Source/wtf/WTFThreadData.cpp

 /*
  * Copyright (C) 2008, 2010 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 17 matching lines @@
 
 #include "wtf/text/AtomicStringTable.h"
 #include "wtf/text/TextCodecICU.h"
 
 namespace WTF {
 
 ThreadSpecific<WTFThreadData>* WTFThreadData::staticData;
 
 WTFThreadData::WTFThreadData()
     : m_atomicStringTable(new AtomicStringTable)
-    , m_compressibleStringTable(nullptr)
-    , m_compressibleStringTableDestructor(nullptr)
     , m_cachedConverterICU(new ICUConverterWrapper)
 {
 }
 
 WTFThreadData::~WTFThreadData()
 {
-    if (m_compressibleStringTableDestructor)
-        m_compressibleStringTableDestructor(m_compressibleStringTable);
 }
 
 } // namespace WTF