Oilpan: move editing objects to the heap.

Source/core/editing/SetNodeAttributeCommand.cpp

Index: Source/core/editing/SetNodeAttributeCommand.cpp
diff --git a/Source/core/editing/SetNodeAttributeCommand.cpp b/Source/core/editing/SetNodeAttributeCommand.cpp
index 2d4b7ee8f9dd045b33bbd896bdc5b1b2893c87a8..54e7b23b64f68f35615d647af6ad161cef7fb3d2 100644
--- a/Source/core/editing/SetNodeAttributeCommand.cpp
+++ b/Source/core/editing/SetNodeAttributeCommand.cpp
@@ -31,7 +31,7 @@
 
 namespace WebCore {
 
-SetNodeAttributeCommand::SetNodeAttributeCommand(PassRefPtr<Element> element,
+SetNodeAttributeCommand::SetNodeAttributeCommand(PassRefPtrWillBeRawPtr<Element> element,
         const QualifiedName& attribute, const AtomicString& value)
     : SimpleEditCommand(element->document())
     , m_element(element)
@@ -53,4 +53,10 @@ void SetNodeAttributeCommand::doUnapply()
     m_oldValue = nullAtom;
 }
 
+void SetNodeAttributeCommand::trace(Visitor* visitor)
+{
+    visitor->trace(m_element);
+    SimpleEditCommand::trace(visitor);
+}
+
 } // namespace WebCore