Oilpan: Prepare to move form control ua shadow elements to Oilpan heap.

Source/core/html/shadow/ClearButtonElement.cpp

Index: Source/core/html/shadow/ClearButtonElement.cpp
diff --git a/Source/core/html/shadow/ClearButtonElement.cpp b/Source/core/html/shadow/ClearButtonElement.cpp
index c67e02d3d1bf415513ed3a414b5618b0144e65cb..5527cdf5bb631c8c65bfc80484d96735c4bc3110 100644
--- a/Source/core/html/shadow/ClearButtonElement.cpp
+++ b/Source/core/html/shadow/ClearButtonElement.cpp
@@ -43,9 +43,9 @@ inline ClearButtonElement::ClearButtonElement(Document& document, ClearButtonOwn
 {
 }
 
-PassRefPtr<ClearButtonElement> ClearButtonElement::create(Document& document, ClearButtonOwner& clearButtonOwner)
+PassRefPtrWillBeRawPtr<ClearButtonElement> ClearButtonElement::create(Document& document, ClearButtonOwner& clearButtonOwner)
 {
-    RefPtr<ClearButtonElement> element = adoptRef(new ClearButtonElement(document, clearButtonOwner));
+    RefPtrWillBeRawPtr<ClearButtonElement> element = adoptRefWillBeRefCountedGarbageCollected(new ClearButtonElement(document, clearButtonOwner));
     element->setShadowPseudoId(AtomicString("-webkit-clear-button", AtomicString::ConstructFromLiteral));
     element->setAttribute(idAttr, ShadowElementNames::clearButton());
     return element.release();
@@ -117,4 +117,10 @@ bool ClearButtonElement::isClearButtonElement() const
     return true;
 }
 
+void ClearButtonElement::trace(Visitor* visitor)
+{
+    visitor->trace(m_clearButtonOwner);
+    HTMLDivElement::trace(visitor);
+}
+
 }