Oilpan: fix build after r183913.

Source/core/dom/FirstLetterPseudoElement.cpp

Index: Source/core/dom/FirstLetterPseudoElement.cpp
diff --git a/Source/core/dom/FirstLetterPseudoElement.cpp b/Source/core/dom/FirstLetterPseudoElement.cpp
index 89c59440f4a6ac63f337f5504f81f683fca34fd9..8fb97d243e083323ac26bad887097a2a073a84b6 100644
--- a/Source/core/dom/FirstLetterPseudoElement.cpp
+++ b/Source/core/dom/FirstLetterPseudoElement.cpp
@@ -156,11 +156,6 @@ RenderObject* FirstLetterPseudoElement::firstLetterTextRenderer(const Element& e
     return firstLetterTextRenderer;
 }
 
-PassRefPtrWillBeRawPtr<FirstLetterPseudoElement> FirstLetterPseudoElement::create(Element* parent)
-{
-    return adoptRefWillBeNoop(new FirstLetterPseudoElement(parent));
-}
-
 FirstLetterPseudoElement::FirstLetterPseudoElement(Element* parent)
     : PseudoElement(parent, FIRST_LETTER)
     , m_remainingTextRenderer(nullptr)
@@ -168,6 +163,16 @@ FirstLetterPseudoElement::FirstLetterPseudoElement(Element* parent)
 {
 }
 
+FirstLetterPseudoElement::~FirstLetterPseudoElement()
+{
+}
+
+void FirstLetterPseudoElement::trace(Visitor* visitor)
+{
+    visitor->trace(m_remainingTextRenderer);
+    PseudoElement::trace(visitor);
+}
+
 void FirstLetterPseudoElement::setNeedsUpdate()
 {
     m_needsUpdate = true;