Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/html/CollectionItemsCache.h

 /*
  * Copyright (C) 2012,2013 Google Inc. All rights reserved.
  * Copyright (C) 2014 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 48 matching lines @@
     void invalidate();
 
 private:
     ptrdiff_t allocationSize() const { return m_cachedList.capacity() * sizeof(NodeType*); }
     static void reportExtraMemoryCostForCollectionItemsCache(ptrdiff_t diff)
     {
         v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(diff);
     }
 
     bool m_listValid;
-    WillBeHeapVector<RawPtrWillBeMember<NodeType>> m_cachedList;
+    HeapVector<Member<NodeType>> m_cachedList;
 };
 
 template <typename Collection, typename NodeType>
 CollectionItemsCache<Collection, NodeType>::CollectionItemsCache()
     : m_listValid(false)
 {
 }
 
 template <typename Collection, typename NodeType>
 CollectionItemsCache<Collection, NodeType>::~CollectionItemsCache()
@@ skipping 39 matching lines @@
     if (m_listValid) {
         ASSERT(this->isCachedNodeCountValid());
         return index < this->cachedNodeCount() ? m_cachedList[index] : nullptr;
     }
     return Base::nodeAt(collection, index);
 }
 
 } // namespace blink
 
 #endif // CollectionItemsCache_h