Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/dom/ElementRareData.cpp

 /*
  * Copyright (C) 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 21 matching lines @@
 #include "core/dom/CompositorProxiedPropertySet.h"
 #include "core/style/ComputedStyle.h"
 
 namespace blink {
 
 struct SameSizeAsElementRareData : NodeRareData {
     short indices[1];
     LayoutSize sizeForResizing;
     IntSize scrollOffset;
     void* pointers[13];
-    PersistentWillBeMember<void*> persistentMember[2];
+    Member<void*> persistentMember[2];
 };
 
 CSSStyleDeclaration& ElementRareData::ensureInlineCSSStyleDeclaration(Element* ownerElement)
 {
     if (!m_cssomWrapper)
-        m_cssomWrapper = adoptPtrWillBeNoop(new InlineCSSStyleDeclaration(ownerElement));
+        m_cssomWrapper = new InlineCSSStyleDeclaration(ownerElement);
     return *m_cssomWrapper;
 }
 
 AttrNodeList& ElementRareData::ensureAttrNodeList()
 {
     if (!m_attrNodeList)
         m_attrNodeList = adoptPtrWillBeNoop(new AttrNodeList);
     return *m_attrNodeList;
 }
 
@@ skipping 13 matching lines @@
     visitor->trace(m_generatedAfter);
     visitor->trace(m_generatedFirstLetter);
     visitor->trace(m_backdrop);
     visitor->trace(m_intersectionObserverData);
     NodeRareData::traceAfterDispatch(visitor);
 }
 
 static_assert(sizeof(ElementRareData) == sizeof(SameSizeAsElementRareData), "ElementRareData should stay small");
 
 } // namespace blink