Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/css/CSSStyleRule.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2005, 2006, 2008, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 13 matching lines @@
 #include "core/css/CSSSelector.h"
 #include "core/css/CSSStyleSheet.h"
 #include "core/css/PropertySetCSSStyleDeclaration.h"
 #include "core/css/StylePropertySet.h"
 #include "core/css/StyleRule.h"
 #include "core/css/parser/CSSParser.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
-using SelectorTextCache = WillBePersistentHeapHashMap<RawPtrWillBeWeakMember<const CSSStyleRule>, String>;
+using SelectorTextCache = PersistentHeapHashMap<WeakMember<const CSSStyleRule>, String>;
 
 static SelectorTextCache& selectorTextCache()
 {
     DEFINE_STATIC_LOCAL(SelectorTextCache, cache, ());
     return cache;
 }
 
 CSSStyleRule::CSSStyleRule(StyleRule* styleRule, CSSStyleSheet* parent)
     : CSSRule(parent)
     , m_styleRule(styleRule)
@@ skipping 86 matching lines @@
 }
 
 DEFINE_TRACE(CSSStyleRule)
 {
     visitor->trace(m_styleRule);
     visitor->trace(m_propertiesCSSOMWrapper);
     CSSRule::trace(visitor);
 }
 
 } // namespace blink