Detach first letter pseudo element during RenderTextFragment destruction.

Source/core/rendering/RenderTextFragment.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 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 35 matching lines @@
     , m_start(0)
     , m_end(str ? str->length() : 0)
     , m_isRemainingTextRenderer(false)
     , m_contentString(str)
     , m_firstLetterPseudoElement(nullptr)
 {
 }
 
 RenderTextFragment::~RenderTextFragment()
 {
-#if !ENABLE(OILPAN)
+    ASSERT(!m_firstLetterPseudoElement);
+}
+
+void RenderTextFragment::destroy()
+{
     if (m_isRemainingTextRenderer && m_firstLetterPseudoElement)
         m_firstLetterPseudoElement->setRemainingTextRenderer(nullptr);
     m_firstLetterPseudoElement = nullptr;
-#endif
+    RenderText::destroy();
 }
 
 void RenderTextFragment::trace(Visitor* visitor)
 {
     visitor->trace(m_firstLetterPseudoElement);
     RenderText::trace(visitor);
 }
 
 PassRefPtr<StringImpl> RenderTextFragment::completeText() const
 {
@@ skipping 62 matching lines @@
         FirstLetterPseudoElement* pseudo = toFirstLetterPseudoElement(node);
         RenderObject* nextRenderer = FirstLetterPseudoElement::firstLetterTextRenderer(*pseudo);
         if (!nextRenderer)
             return nullptr;
         node = nextRenderer->node();
     }
     return (node && node->isTextNode()) ? toText(node) : nullptr;
 }
 
 } // namespace blink