Track connected subframes per-Document instead of per-Node.

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 {
-
-class ElementShadow;
-class HTMLFrameOwnerElement;
-class Node;
-
-class ChildFrameDisconnector {
-    STACK_ALLOCATED();
-public:
-    enum DisconnectPolicy {
-        RootAndDescendants,
-        DescendantsOnly
-    };
-
-    explicit ChildFrameDisconnector(Node& root)
-        : m_root(root)
-    {
-    }
-
-    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;
-};
-
-} // namespace blink
-
-#endif // ChildFrameDisconnector_h