Remove unnecessary includes from dom.

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

 /*
  * Copyright (C) 2012 Google 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.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 11 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef UserActionElementSet_h
 #define UserActionElementSet_h
 
 #include "platform/heap/Handle.h"
 #include "wtf/HashMap.h"
-#include "wtf/PassOwnPtr.h"
-#include "wtf/RefPtr.h"
 
 namespace blink {
 
 class Node;
 class Element;
 
 class UserActionElementSet final {
     DISALLOW_NEW();
 public:
     bool isFocused(const Node* node) { return hasFlags(node, IsFocusedFlag); }
@@ skipping 33 matching lines @@
     void clearFlags(Element*, unsigned);
     bool hasFlags(const Element*, unsigned flags) const;
 
     typedef HeapHashMap<Member<Element>, unsigned> ElementFlagMap;
     ElementFlagMap m_elements;
 };
 
 } // namespace blink
 
 #endif // UserActionElementSet_h