Oilpan: Replace RefPtrs to Node and its subclasses in core/html with Oilpan transitin types.

Source/core/html/shadow/SpinButtonElement.h

Index: Source/core/html/shadow/SpinButtonElement.h
diff --git a/Source/core/html/shadow/SpinButtonElement.h b/Source/core/html/shadow/SpinButtonElement.h
index d29fdbe4b47010e07ddf76e644715a0f83a7c24b..25c0b30d8b3e378bb14abab3f300b0b3e04fd889 100644
--- a/Source/core/html/shadow/SpinButtonElement.h
+++ b/Source/core/html/shadow/SpinButtonElement.h
@@ -58,7 +58,7 @@ public:
     // The owner of SpinButtonElement must call removeSpinButtonOwner
     // because SpinButtonElement can be outlive SpinButtonOwner
     // implementation, e.g. during event handling.
-    static PassRefPtr<SpinButtonElement> create(Document&, SpinButtonOwner&);
+    static PassRefPtrWillBeRawPtr<SpinButtonElement> create(Document&, SpinButtonOwner&);
     UpDownState upDownState() const { return m_upDownState; }
     void releaseCapture(EventDispatch = EventDispatchAllowed);
     void removeSpinButtonOwner() { m_spinButtonOwner = nullptr; }