Remove unnecessary includes from dom.

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

 /*
  * Copyright (C) 2011 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 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 MutationRecord_h
 #define MutationRecord_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "platform/heap/Handle.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class Node;
 class QualifiedName;
 template <typename NodeType> class StaticNodeTypeList;
 typedef StaticNodeTypeList<Node> StaticNodeList;
 
 class MutationRecord : public GarbageCollectedFinalized<MutationRecord>, public ScriptWrappable {
@@ skipping 21 matching lines @@
 
     virtual String oldValue() { return String(); }
 
     DEFINE_INLINE_VIRTUAL_TRACE() { }
 
 };
 
 } // namespace blink
 
 #endif // MutationRecord_h