Oilpan: Prepare to move PickerIndicatorElement to Oilpan heap.

Source/core/html/shadow/PickerIndicatorElement.cpp

Index: Source/core/html/shadow/PickerIndicatorElement.cpp
diff --git a/Source/core/html/shadow/PickerIndicatorElement.cpp b/Source/core/html/shadow/PickerIndicatorElement.cpp
index 06452e65e8400b335d1994c2c371297129268532..cb31abc4c6fc46a17f936bff035a1722c5844dd0 100644
--- a/Source/core/html/shadow/PickerIndicatorElement.cpp
+++ b/Source/core/html/shadow/PickerIndicatorElement.cpp
@@ -50,9 +50,9 @@ inline PickerIndicatorElement::PickerIndicatorElement(Document& document, Picker
 {
 }
 
-PassRefPtr<PickerIndicatorElement> PickerIndicatorElement::create(Document& document, PickerIndicatorOwner& pickerIndicatorOwner)
+PassRefPtrWillBeRawPtr<PickerIndicatorElement> PickerIndicatorElement::create(Document& document, PickerIndicatorOwner& pickerIndicatorOwner)
 {
-    RefPtr<PickerIndicatorElement> element = adoptRef(new PickerIndicatorElement(document, pickerIndicatorOwner));
+    RefPtrWillBeRawPtr<PickerIndicatorElement> element = adoptRefWillBeRefCountedGarbageCollected(new PickerIndicatorElement(document, pickerIndicatorOwner));
     element->setShadowPseudoId(AtomicString("-webkit-calendar-picker-indicator", AtomicString::ConstructFromLiteral));
     element->setAttribute(idAttr, ShadowElementNames::pickerIndicator());
     return element.release();
@@ -143,6 +143,12 @@ bool PickerIndicatorElement::isPickerIndicatorElement() const
     return true;
 }
 
+void PickerIndicatorElement::trace(Visitor* visitor)
+{
+    visitor->trace(m_pickerIndicatorOwner);
+    HTMLDivElement::trace(visitor);
+}
+
 }
 
 #endif