Oilpan: Prepare to move RenderObject and RenderObjectChildList to Oilpan heap.

Source/core/frame/FrameView.h

Index: Source/core/frame/FrameView.h
diff --git a/Source/core/frame/FrameView.h b/Source/core/frame/FrameView.h
index ea350ef548622fd2fd9b50f7bd0741a2bbfe5631..f9c47582871ce2fdf1958d1b219f6a6ae6fd0d3f 100644
--- a/Source/core/frame/FrameView.h
+++ b/Source/core/frame/FrameView.h
@@ -409,11 +409,11 @@ private:
 
     LayoutSize m_size;
 
-    typedef HashSet<RefPtr<RenderEmbeddedObject> > EmbeddedObjectSet;
-    EmbeddedObjectSet m_widgetUpdateSet;
+    typedef WillBeHeapHashSet<RefPtrWillBeMember<RenderEmbeddedObject> > EmbeddedObjectSet;
+    WillBePersistentHeapHashSet<RefPtrWillBeMember<RenderEmbeddedObject> > m_widgetUpdateSet;
 
     // FIXME: These are just "children" of the FrameView and should be RefPtr<Widget> instead.
-    HashSet<RefPtr<RenderWidget> > m_widgets;
+    WillBePersistentHeapHashSet<RefPtrWillBeMember<RenderWidget> > m_widgets;
 
     RefPtr<LocalFrame> m_frame;
 
@@ -470,7 +470,7 @@ private:
     RefPtrWillBePersistent<Node> m_maintainScrollPositionAnchor;
 
     // Renderer to hold our custom scroll corner.
-    RenderScrollbarPart* m_scrollCorner;
+    RawPtrWillBePersistent<RenderScrollbarPart> m_scrollCorner;
 
     // If true, automatically resize the frame view around its content.
     bool m_shouldAutoSize;