Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/layout/LayoutScrollbar.h

 /*
  * Copyright (C) 2008, 2009 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 25 matching lines @@
 class ComputedStyle;
 class LayoutBox;
 class LayoutBoxModelObject;
 class LayoutScrollbarPart;
 class LocalFrame;
 class Node;
 class PaintInvalidationState;
 
 class LayoutScrollbar final : public Scrollbar {
 public:
-    static PassRefPtrWillBeRawPtr<Scrollbar> createCustomScrollbar(ScrollableArea*, ScrollbarOrientation, Node*, LocalFrame* owningFrame = nullptr);
+    static RawPtr<Scrollbar> createCustomScrollbar(ScrollableArea*, ScrollbarOrientation, Node*, LocalFrame* owningFrame = nullptr);
     ~LayoutScrollbar() override;
 
     LayoutBox* owningLayoutObject() const;
     LayoutBox* owningLayoutObjectWithinFrame() const;
 
     IntRect buttonRect(ScrollbarPart) const;
     IntRect trackRect(int startLength, int endLength) const;
     IntRect trackPieceRectWithMargins(ScrollbarPart, const IntRect&) const;
 
     int minimumThumbLength() const;
@@ skipping 25 matching lines @@
 
     void updateScrollbarParts(bool destroy = false);
 
     PassRefPtr<ComputedStyle> getScrollbarPseudoStyle(ScrollbarPart, PseudoId);
     void updateScrollbarPart(ScrollbarPart, bool destroy = false);
 
     // This Scrollbar(Widget) may outlive the DOM which created it (during tear down),
     // so we keep a reference to the Node which caused this custom scrollbar creation.
     // This will not create a reference cycle as the Widget tree is owned by our containing
     // FrameView which this Node pointer can in no way keep alive. See webkit bug 80610.
-    RefPtrWillBeMember<Node> m_owner;
+    Member<Node> m_owner;
 
-    RawPtrWillBeMember<LocalFrame> m_owningFrame;
+    Member<LocalFrame> m_owningFrame;
 
     HashMap<unsigned, LayoutScrollbarPart*> m_parts;
 };
 
 DEFINE_TYPE_CASTS(LayoutScrollbar, ScrollbarThemeClient, scrollbar, scrollbar->isCustomScrollbar(), scrollbar.isCustomScrollbar());
 
 } // namespace blink
 
 #endif // LayoutScrollbar_h