Clean up markClientsAndObserversFinished().

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

 /*
  * Copyright (C) 2006, 2007, 2009 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 122 matching lines @@
     static bool canLoadFrame(HTMLFrameOwnerElement& owner)
     {
         for (Node* node = &owner; node; node = node->parentOrShadowHostNode()) {
             if (disabledSubtreeRoots().contains(node))
                 return false;
         }
         return true;
     }
 
 private:
-    CORE_EXPORT static HeapHashCountedSet<Member<Node>>& disabledSubtreeRoots();
+    using SubtreeRootSet = HeapHashCountedSet<Member<Node>>;
+
+    CORE_EXPORT static SubtreeRootSet& disabledSubtreeRoots();
 
     Member<Node> m_root;
 };
 
 DEFINE_TYPE_CASTS(HTMLFrameOwnerElement, FrameOwner, owner, owner->isLocal(), owner.isLocal());
 
 } // namespace blink
 
 #endif // HTMLFrameOwnerElement_h