Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/modules/accessibility/AXSpinButton.h

 /*
  * Copyright (C) 2011 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
@@ skipping 36 matching lines @@
     explicit AXSpinButton(AXObjectCacheImpl&);
 
     AccessibilityRole roleValue() const override;
     bool isSpinButton() const override { return true; }
     bool isNativeSpinButton() const override { return true; }
     void addChildren() override;
     LayoutRect elementRect() const override;
     void detach() override;
     void detachFromParent() override;
 
-    RawPtrWillBeMember<SpinButtonElement> m_spinButtonElement;
+    Member<SpinButtonElement> m_spinButtonElement;
 };
 
 class AXSpinButtonPart final : public AXMockObject {
 public:
     static AXSpinButtonPart* create(AXObjectCacheImpl&);
     ~AXSpinButtonPart() override { }
     void setIsIncrementor(bool value) { m_isIncrementor = value; }
 
 private:
     explicit AXSpinButtonPart(AXObjectCacheImpl&);
     bool m_isIncrementor : 1;
 
     bool press() const override;
     AccessibilityRole roleValue() const override { return ButtonRole; }
     bool isSpinButtonPart() const override { return true; }
     LayoutRect elementRect() const override;
 };
 
 DEFINE_AX_OBJECT_TYPE_CASTS(AXSpinButton, isNativeSpinButton());
 DEFINE_AX_OBJECT_TYPE_CASTS(AXSpinButtonPart, isSpinButtonPart());
 
 } // namespace blink
 
 #endif // AXSpinButton_h