Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/xml/XPathResult.h

Index: third_party/WebKit/Source/core/xml/XPathResult.h
diff --git a/third_party/WebKit/Source/core/xml/XPathResult.h b/third_party/WebKit/Source/core/xml/XPathResult.h
index 3b1546561d3a7d970daac649c26d912b7f28b7cd..927af13ad655c5e9af5d98a48fe9d9741a4e05cf 100644
--- a/third_party/WebKit/Source/core/xml/XPathResult.h
+++ b/third_party/WebKit/Source/core/xml/XPathResult.h
@@ -44,7 +44,6 @@ struct EvaluationContext;
 
 // TODO(Oilpan): remove Finalized when transition type for m_document is.
 class XPathResult final : public GarbageCollectedFinalized<XPathResult>, public ScriptWrappable {
-    DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(XPathResult);
     DEFINE_WRAPPERTYPEINFO();
 public:
     enum XPathResultType {
@@ -91,7 +90,7 @@ private:
     unsigned m_nodeSetPosition;
     Member<XPath::NodeSet> m_nodeSet; // FIXME: why duplicate the node set stored in m_value?
     unsigned short m_resultType;
-    RefPtrWillBeMember<Document> m_document;
+    Member<Document> m_document;
     uint64_t m_domTreeVersion;
 };