Oilpan: fix build after r196753.

Source/core/loader/FrameLoader.h

Index: Source/core/loader/FrameLoader.h
diff --git a/Source/core/loader/FrameLoader.h b/Source/core/loader/FrameLoader.h
index b62372db8fbb43d1d8fb809abe62f59c1b143e91..82b5b1d0fa8418561dc01d8e46e09650b1bee5db 100644
--- a/Source/core/loader/FrameLoader.h
+++ b/Source/core/loader/FrameLoader.h
@@ -228,9 +228,14 @@ private:
     RefPtrWillBeMember<HistoryItem> m_currentItem;
     RefPtrWillBeMember<HistoryItem> m_provisionalItem;
 
-    struct DeferredHistoryLoad {
+    class DeferredHistoryLoad : public NoBaseWillBeGarbageCollectedFinalized<DeferredHistoryLoad> {
         DISALLOW_COPY(DeferredHistoryLoad);
     public:
+        static PassOwnPtrWillBeRawPtr<DeferredHistoryLoad> create(ResourceRequest request, HistoryItem* item, FrameLoadType loadType, HistoryLoadType historyLoadType)
+        {
+            return adoptPtrWillBeNoop(new DeferredHistoryLoad(request, item, loadType, historyLoadType));
+        }
+
         DeferredHistoryLoad(ResourceRequest request, HistoryItem* item, FrameLoadType loadType,
             HistoryLoadType historyLoadType)
             : m_request(request)
@@ -240,8 +245,6 @@ private:
         {
         }
 
-        DeferredHistoryLoad() { }
-
         DEFINE_INLINE_TRACE()
         {
             visitor->trace(m_item);
@@ -253,7 +256,7 @@ private:
         HistoryLoadType m_historyLoadType;
     };
 
-    OwnPtr<DeferredHistoryLoad> m_deferredHistoryLoad;
+    OwnPtrWillBeMember<DeferredHistoryLoad> m_deferredHistoryLoad;
 
     bool m_inStopAllLoaders;