Oilpan: Prepare moving AXObject to heap

Source/modules/accessibility/AXTable.cpp

Index: Source/modules/accessibility/AXTable.cpp
diff --git a/Source/modules/accessibility/AXTable.cpp b/Source/modules/accessibility/AXTable.cpp
index bbad9ccab57f3c9374d9d11a8cafefc5847dd080..91d1f73589db00d22f0fb84649d83c91aa37c917 100644
--- a/Source/modules/accessibility/AXTable.cpp
+++ b/Source/modules/accessibility/AXTable.cpp
@@ -65,9 +65,9 @@ void AXTable::init()
     m_isAXTable = isTableExposableThroughAccessibility();
 }
 
-PassRefPtr<AXTable> AXTable::create(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
+PassRefPtrWillBeRawPtr<AXTable> AXTable::create(LayoutObject* layoutObject, AXObjectCacheImpl& axObjectCache)
 {
-    return adoptRef(new AXTable(layoutObject, axObjectCache));
+    return adoptRefWillBeNoop(new AXTable(layoutObject, axObjectCache));
 }
 
 bool AXTable::hasARIARole() const
@@ -592,4 +592,12 @@ String AXTable::deprecatedTitle(TextUnderElementMode mode) const
     return title;
 }
 
+DEFINE_TRACE(AXTable)
+{
+    visitor->trace(m_rows);
+    visitor->trace(m_columns);
+    visitor->trace(m_headerContainer);
+    AXLayoutObject::trace(visitor);
+}
+
 } // namespace blink