Detach first letter pseudo element during RenderTextFragment destruction.

Source/core/rendering/RenderTextFragment.cpp

Index: Source/core/rendering/RenderTextFragment.cpp
diff --git a/Source/core/rendering/RenderTextFragment.cpp b/Source/core/rendering/RenderTextFragment.cpp
index bd640c89a748e7a4e90af8562ddf5966f95310c1..b1157c9b8bf83e91643ed6e060c83595d4367557 100644
--- a/Source/core/rendering/RenderTextFragment.cpp
+++ b/Source/core/rendering/RenderTextFragment.cpp
@@ -53,11 +53,15 @@ RenderTextFragment::RenderTextFragment(Node* node, StringImpl* str)
 
 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)