Oilpan: Validate pointers stored in Member

Source/core/editing/iterators/TextIterator.cpp

Index: Source/core/editing/iterators/TextIterator.cpp
diff --git a/Source/core/editing/iterators/TextIterator.cpp b/Source/core/editing/iterators/TextIterator.cpp
index 3c6856fb89376b03df5d1cf4472e89bac838d9d4..79cd9300c05fb4be633219a2f2e968dc9c1b2f6d 100644
--- a/Source/core/editing/iterators/TextIterator.cpp
+++ b/Source/core/editing/iterators/TextIterator.cpp
@@ -485,7 +485,7 @@ bool TextIteratorAlgorithm<Strategy>::handleTextNode()
 template<typename Strategy>
 void TextIteratorAlgorithm<Strategy>::handleTextBox()
 {
-    LayoutText* layoutObject = m_firstLetterText ? m_firstLetterText.get() : toLayoutText(m_node->layoutObject());
+    LayoutText* layoutObject = m_firstLetterText ? m_firstLetterText : toLayoutText(m_node->layoutObject());
 
     if (layoutObject->style()->visibility() != VISIBLE && !ignoresStyleVisibility()) {
         m_textBox = nullptr;