Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/dom/ChildFrameDisconnector.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ChildFrameDisconnector_h
 #define ChildFrameDisconnector_h
 
 #include "platform/heap/Handle.h"
 
 namespace blink {
@@ skipping 16 matching lines @@
     }
 
     void disconnect(DisconnectPolicy = RootAndDescendants);
 
 private:
     void collectFrameOwners(Node&);
     void collectFrameOwners(ElementShadow&);
     void disconnectCollectedFrameOwners();
     Node& root() const { return *m_root; }
 
-    WillBeHeapVector<RefPtrWillBeMember<HTMLFrameOwnerElement>, 10> m_frameOwners;
-    RawPtrWillBeMember<Node> m_root;
+    HeapVector<Member<HTMLFrameOwnerElement>, 10> m_frameOwners;
+    Member<Node> m_root;
 };
 
 } // namespace blink
 
 #endif // ChildFrameDisconnector_h